WILL MARK BRAINLIEST + 50 POINTS!!!! Your ice-cream cart can hold 550 frozen treats. Your friend Anna also has an ice-cream cart and sold frozen treats last summer. She has agreed to help you decide which frozen treats to sell.
Table 1 displays the cost to you, the selling price, and the profit of some frozen treats.

Choco bar cost you $0.75 ea, selling price $2.00, profit for each sale $1.25

Ice cream sandwich cost you $0.85 each, selling price $2.25, profit $1.40

Frozen fruit bar cost you $0.50 each, selling price $1.80, profit $1.30

Your goal is to make profit of at least $700.

Enter an inequality to represent the number of chocolate fudge bars, c the number of ice-cream sandwiches, I, and the number of frozen fruit bars, F, that will make a profit of at least $700

Answer:

3q(4q+5)

Step-by-step explanation:

Factor 3q out of [tex]12q^{2}[/tex] which equals = 3q (4q)+15q

Then factor 3q out of 15q which equals =3q (4q) +3q (5)

Last factoring step is to factor 3q out of 3q (4q) +3q (5) to get your final answer which is 3q(4q+5)

The value of RS in given question is 13°

A chord of a circle is a straight line segment whose endpoints both lie on a circular arc. If a chord were to be extended infinitely on both directions into a line, the object is a secant line. More generally, a chord is a line segment joining two points on any curve, for instance, an ellipse.

According to question

RS = PQ

= 11x - 72 = 5x + 6

=11x - 5x = 6 + 72

6x = 78

x = 78/6

x= 13°

So,the value of RS is 13°

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The solution to the problem is: d/dx ∫_1ˣ sec(t)dt = sec(x)tan(x) . To solve this problem, we first need to apply the fundamental theorem of calculus, which states that:

d/dx ∫_aˣ f(t)dt = f(x)

In other words, the derivative of an integral with respect to its upper limit is equal to the integrand evaluated at the upper limit.

Applying this theorem to the given integral, we get:

d/dx ∫_1ˣ sec(t)dt = sec(x)

Now we need to apply the chain rule to the right-hand side to find the derivative of the integral with respect to x:

d/dx ∫_1ˣ sec(t)dt = d/dx sec(x) = sec(x)tan(x)

Therefore, the solution to the problem is: d/dx ∫_1ˣ sec(t)dt = sec(x)tan(x)

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The value of x is 95.25 that is Aunty Mansah gave 95 oranges to her.

She bought 100 oranges at a rate of 4 for 0.20gp which means she spent:

(100/4) * 0.20gp

= 5.00gp on the oranges.

She sold remaining (100 - x) oranges at a rate of 5 for 0.40gp which means she earned:

((100 - x)/5) * 0.40gp

= (8/5)(100 - x)gp from the sale.

Her total profit is given as 2.60gp, so, we set up equation which is:

(8/5)(100 - x)gp - 5.00gp = 2.60gp

Solving for x, we get:

(8/5)(100 - x)gp = 7.60gp

100 - x = (5/8) * 7.60

100 - x = 4.75

x = 100 - 4.75

x = 95.25

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The test statistic for testing the claim that μ ≤ 38 at a level of significance of α = 0.01, based on the given sample statistics of n = 43 and s = 4.7, is calculated to be -6.12.

The null hypothesis (H0) is that the population mean (μ) is less than or equal to 38, and the alternative hypothesis (H1) is that μ is greater than 38.

The level of significance (α) is given as 0.01, which represents the probability of rejecting the null hypothesis when it is actually true.

The sample statistics provided are n = 43, which represents the sample size, and s = 4.7, which represents the sample standard deviation.

The test statistic for this one-sample t-test is calculated as:

t = (x - μ) / (s / √n)

where x is the sample mean, μ is the hypothesized population mean under the null hypothesis, s is the sample standard deviation, and n is the sample size.

Since the null hypothesis is that μ ≤ 38, we can substitute μ = 38 in the test statistic formula.

Plugging in the given values, we get:

t = (x - 38) / (4.7 / √43)

However, we are interested in the value of t when μ ≤ 38, which means we are looking for the lower tail critical value. Since the alternative hypothesis is one-sided (greater than), we need to use the one-tailed critical value for a 0.01 level of significance. Using a t-table or a t-distribution calculator, we can find that the critical value for a one-tailed test at α = 0.01 with degrees of freedom (df) equal to 42 (n - 1) is approximately 2.66.

Comparing the calculated t-value with the critical value, we have:

t = (x - 38) / (4.7 / √43) = (x - 38) / 0.7234

Since μ ≤ 38, the numerator (x - 38) will be negative.

Plugging in the given values for x = sample mean and s = sample standard deviation into the formula, we get:

t = (x - 38) / 0.7234 = (-6.12) / 0.7234 = -8.47 (rounded to two decimal places)

Therefore, the test statistic for testing the claim that μ ≤ 38 at a level of significance of α = 0.01 is -8.47.

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The new coordinates of point C is (1, -4) and the triangles are congruent

Given that

We have

C = (3, 8)

The first rule is

C' = (-x, -y)

So, we have

C' = (-3, -8)

The next rule is

C'' = (x + 4, y + 4)

So, we have

C'' = (1, -4)

Also, the triangle and the image are congruent because the transformations are rigid transformations

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The area which is used to cover in grated tomato having square-shaped piece of bread with given side is equal to 9b^2 square inches.

The side length of the square-shaped piece of bread is 3b inches

The area you need to cover in grated tomato is equal to the area of the square-shaped piece of bread.

The formula for the area of a square is,

Area of the square = side length x side length

Substitute the value of the side length of the square-shaped piece of bread we have,

⇒ Area of the bread  = (3b) x (3b)

Simplifying the expression we get,

⇒ Area of the bread = 9b^2

Therefore, area used to cover in grated tomato of a square-shaped piece of bread with side length 3b inches is 9b^2 square inches.

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The estimated cost of the same goods and services on January 1, 2010 is approximately $715.07.

To estimate the cost of the same goods and services on January 1, 2010, we will use the exponential growth formula:

[tex]Future Value (FV) = Present Value (PV) * (1 + growth rate)^number of years[/tex]

1. Determine the growth rate:
Initial cost in 1995 (PV) = $600
Final cost in 2007 (FV) = $689.64
Number of years from 1995 to 2007 = 12 years

[tex]$689.64 = $600 * (1 + growth rate)^12[/tex]

Divide both sides by $600:
[tex]1.1494 = (1 + growth rate)^12[/tex]

Take the 12th root of both sides to find the annual growth rate:
1.0123 = 1 + growth rate

Subtract 1 from both sides to find the growth rate:
0.0123 = growth rate (or 1.23% per year)

2. Estimate the cost in 2010:
Number of years from 2007 to 2010 = 3 years

[tex]FV_2010 = $689.64 * (1 + 0.0123)^3[/tex]
[tex]FV_2010 = $689.64 * (1.0123)^3[/tex]
FV_2010 = $689.64 * 1.0373
FV_2010 ≈ $715.07

Therefore, the estimated cost of the same goods and services on January 1, 2010 is approximately $715.07.

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Content validation is often used to ensure that selection procedures measure job-related factors and comply with legal and professional standards.

Content validation is often used for the following two reasons:

To ensure that the selection procedure measures the knowledge, skills, abilities, and other characteristics that are required for successful job performance. This involves conducting a job analysis to identify the critical job-related factors and developing test items that measure those factors directly.

To comply with legal and professional standards for employee selection procedures. Content validation is one of several methods that are recommended by the Equal Employment Opportunity Commission (EEOC) and other professional organizations to ensure that selection procedures are job-related and non-discriminatory. By using content validation, employers can demonstrate that their selection procedures are based on job-related criteria and are not biased against any protected group.

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The limit is less than 1, the series converges by the Ratio Test.

To apply the Ratio Test, we need to take the limit of the ratio of the n+1th term to the nth term as n approaches infinity.

a. [infinity]∑n=1 4/2^n

The nth term of this series is 4/2^n. The n+1th term is 4/2^(n+1) = 4/2^n * 1/2. Taking the limit of the ratio of the n+1th term to the nth term gives:

lim(n→∞) (4/2^n * 1/2)/(4/2^n) = lim(n→∞) 1/2 = 1/2 < 1

Since the limit is less than 1, the series converges by the Ratio Test.

b. [infinity]∑n=1 n!/(2n)!

The nth term of this series is n!/(2n)!. The n+1th term is (n+1)!/(2(n+1)!)= 1/(2(n+1)). Taking the limit of the ratio of the n+1th term to the nth term gives:

lim(n→∞) 1/(2(n+1))/(n!/(2n)!) = lim(n→∞) (n!/2n!)*(2n/(2(n+1))) = lim(n→∞) 1/(n+1) = 0 < 1

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The value of x as required is; 6.

The measure of BD as required is; 12.

The measure of CE as required is; 54.

It follows from the task content that the value of x is to be determined.

By observation; <BAD and <EFC are congruent and hence, the ratio which holds is;

2 / 2x = 9 / 7x + 12

9x = 7x + 12

2x = 12

x = 6.

Therefore, BD = 2x = 2(6) = 12; BD = 12.

Also, CE = 7x + 12 = 7(6) + 12 = 42 + 12; CE = 54.

Ultimately, x = 6, BD = 12 and CE = 54.

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The probability of there being exactly 4 supporters of the Peoples Party in a random sample of 18 voters is 0.240, or approximately 24%.

To solve this problem, we can use the binomial distribution formula:

P(X = k) = (n choose k) * p^k * (1-p)^(n-k)

Where:
- X is the random variable representing the number of supporters of the Peoples Party in the sample
- k = 4 is the number of supporters we're interested in
- n = 18 is the total number of voters in the sample
- p = 0.6 is the probability of supporting the Peoples Party in a single voter

Plugging in these values, we get:

P(X = 4) = (18 choose 4) * 0.6^4 * 0.4^14

Using a calculator, we get:

P(X = 4) = 0.2398 (rounded to four decimal places)

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On solving the provided question ,we can say that By combining related phrases, the following expression results: -3.6x + 24

A sequence is a grouping of "terms," or integers. Term examples are 2, 5, and 8. Some sequences can be extended indefinitely by taking advantage of a specific pattern that they exhibit. Use the sequence 2, 5, 8, and then add 3 to make it longer. Formulas exist that show where to seek for words in a sequence. A sequence (or event) in mathematics is a group of things that are arranged in some way. In that it has components (also known as elements or words), it is similar to a set. The length of the sequence is the set of all, possibly infinite, ordered items. the action of arranging two or more things in a sensible sequence.

Start by placing the negative sign outside of the brackets to simplify the calculation 3(1.2x 3.7) + 12.9:

-3(1.2x - 3.7) + 12.9 = -3(1.2x) + 3(3.7) + 12.9

The concepts included in brackets can then be clarified:

-3(1.2x) = -3.6x

Likewise, clarify the other words:

3(3.7) = 11.1

Finally, you may reintroduce the original phrase using these simplifications:

-3(1.2x - 3.7) + 12.9 = -3.6x + 11.1 + 12.9

By combining related phrases, the following expression results:

-3.6x + 24

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The slope of a line perpendicular to the line whose equation is 3x − 3y=45 is equal to -1.

In Mathematics and Geometry, the point-slope form of a straight line can be calculated by using the following mathematical expression:

y - y₁ = m(x - x₁)

Where:

Since the line is perpendicular to 3x - 3y = 45, the slope is given by;

3x - 3y = 45

3y = 3x - 45

y = 3x/3 - 45/3

y = x - 45

In Mathematics and Geometry, a condition that is true for two lines to be perpendicular is given by:

m₁ × m₂ = -1

1 × m₂ = -1

m₂ = -1

Slope, m₂ = -1

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The function y(x) satisfying dy/dx = 6x^(-12/13) and y(-1) = -8 is:
y(x) = 6(13x^(1/13)) + 70

To find the function y(x) that satisfies the given conditions, we need to integrate the given differential equation, dy/dx = 6x^(-12/13). Then, we can use the initial condition y(-1) = -8 to find the constant of integration.

First, integrate the equation with respect to x:

∫(dy/dx) dx = ∫(6x^(-12/13)) dx

y(x) = 6∫(x^(-12/13)) dx

Using the power rule for integration, we get:

y(x) = 6[(13/1)x^(-12/13+13/13)] + C

y(x) = 6(13x^(1/13)) + C

Now, use the initial condition y(-1) = -8:

-8 = 6(13(-1)^(1/13)) + C

-8 = 6(-13) + C

C = -8 + 78 = 70

So, the function y(x) satisfying dy/dx = 6x^(-12/13) and y(-1) = -8 is:

y(x) = 6(13x^(1/13)) + 70

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The p-value is very small, likely less than 0.0001, providing strong evidence against the null hypothesis that the proportion of fathers who take no responsibility for childcare in Littleton is the same as for American fathers.

What is null hypothesis?

The null hypothesis is a statement that assumes there is no significant difference or relationship between two variables in a population, and any observed difference is due to chance.

what is proportion?

A proportion is a ratio of two quantities that represent a part of a whole, typically expressed as a fraction or a percentage. It measures the relative size of one quantity compared to another.

According to the give information:

To find the p-value for the hypothesis test, we need to follow these steps:

State the null and alternative hypotheses:

Null hypothesis (H0): The proportion of fathers who take no responsibility for childcare in Littleton is the same as the proportion for American fathers, which is 0.34.

Alternative hypothesis (Ha): The proportion of fathers who take no responsibility for childcare in Littleton is higher than the proportion for American fathers, which is greater than 0.34.

Determine the test statistic, which follows a normal distribution under the null hypothesis:

z = (p - P) / √[P(1-P) / n]

where p is the sample proportion, P is the hypothesized proportion under the null hypothesis, and n is the sample size.

In this case, we have:

p = 97/225 = 0.4311

P = 0.34

n = 225

So, the test statistic is:

z = (0.4311 - 0.34) / √[(0.34)(0.66) / 225] = 3.583

Calculate the p-value using the test statistic:

The p-value is the probability of observing a test statistic as extreme or more extreme than the one obtained, assuming the null hypothesis is true.

Since this is a one-tailed test in the upper tail (Ha: proportion is greater than 0.34), we need to find the area to the right of the test statistic in the standard normal distribution.

Using a standard normal distribution table or calculator, we find that the area to the right of z = 3.583 is very close to 0.

Therefore, the p-value is very small, likely less than 0.0001 (the exact value depends on the level of precision used in the standard normal distribution table).

In conclusion, the p-value is very small, which provides strong evidence against the null hypothesis and suggests that the proportion of fathers who take no responsibility for childcare in Littleton is higher than the proportion for American fathers.

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The critical value that should be used in constructing the confidence interval is 2.33

To find the 98% confidence interval for the true difference between the population proportions based on the given data, we need to first find the critical value that should be used in constructing the confidence interval. This critical value is based on the level of confidence we want to use, which in this case is 98%.

Since we have a two-tailed test (we want to find the confidence interval for the difference between two population proportions), we need to find the z-score that corresponds to a tail area of 0.01 on each side of the distribution.

Using a standard normal distribution table or calculator, we can find that the z-score for a 0.01 tail area (or 98% confidence level) is approximately 2.33. This means that we can construct a confidence interval for the true difference between the population proportions using the formula:

(confidence interval) = (p1 - p2) ± z√((p1(1-p1))/n1 + (p2(1-p2))/n2)

where p1 and p2 are the sample proportions, n1 and n2 are the sample sizes, and z is the critical value we just found as 2.33.

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By completing the square we can see that the correct option is A:

(x - 5)² = 36

To get this, we need to complete squares.

Rememeber the perfect square trinomial:

(a + b)² = a² + b² + 2ab

The given quadratic equation is:

x² -10x  -11  = 0

We can rewrite that as:

x² - 2*5*x - 11 = 0

Now we can add and subtract 5² = 25 in both sides, then we will get:

(x² - 2*5*x + 5²) - 11 = 5²

(x - 5)² - 11 = 25

(x - 5)² = 25 + 11 = 36

(x - 5)² = 36

The correct option is A.

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The simplification of all given points as follows. Check each points given below.

Factoring is the process of finding two or more numbers that can be multiplied to produce a given number in mathematics. This is otherwise called tracking down the superb variables of a number.

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We cannot solve the corresponding first-order linear ODE using this technique.

The method of integrating factors is a technique used to solve first-order linear ordinary differential equations (ODEs) of the form:

y'(x) + p(x) y(x) = q(x)

where p(x) and q(x) are continuous functions on some interval I. The idea of the method is to multiply both sides of the equation by an integrating factor, which is a function u(x) chosen to make the left-hand side of the equation the derivative of a product:

u(x) y'(x) + p(x) u(x) y(x) = u(x) q(x)

The goal is to choose u(x) so that the left-hand side of the equation is the derivative of u(x) y(x). If we can find such a function u(x), we can integrate both sides of the equation to obtain:

u(x) y(x) = ∫ u(x) q(x) dx + C

where C is a constant of integration.

Now, if we cannot find an explicit formula for u(x) or the integral ∫ u(x) q(x) dx, the method of integrating factors fails. In other words, we cannot use this technique to solve the ODE. This is because without an explicit formula for u(x), we cannot integrate both sides of the equation to obtain a solution for y(x).

For example, consider the following first-order linear ODE:

y'(x) + x^2 y(x) = x

We can see that p(x) = x^2 and q(x) = x. To apply the method of integrating factors, we need to find a function u(x) such that:

u(x) y'(x) + x^2 u(x) y(x) = x u(x)

We can see that u(x) = e^(x^3/3) is a suitable integrating factor, as it makes the left-hand side of the equation the derivative of e^(x^3/3) y(x). Multiplying both sides of the equation by e^(x^3/3), we obtain:

e^(x^3/3) y'(x) + x^2 e^(x^3/3) y(x) = x e^(x^3/3)

which is equivalent to:

(d/dx)(e^(x^3/3) y(x)) = x e^(x^3/3)

Integrating both sides with respect to x, we obtain:

e^(x^3/3) y(x) = ∫ x e^(x^3/3) dx + C

We can see that the integral on the right-hand side of the equation does not have an explicit formula, so we cannot find an explicit solution for y(x) using the method of integrating factors. In other words, the method fails in this case.

In conclusion, if we cannot compute an explicit formula for one or both of the integrals that appear in the method of integrating factors, we cannot solve the corresponding first-order linear ODE using this technique.

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Answer:

D: (2,0) and (0,-4)

Step-by-step explanation:

The solutions to the graphs are where the 2 seperate graphs intersect with each other

The Null hypothesis needs not be rejected in case I, hence it is false. While a two-factor experiment means that the experimental design includes option A: two independent variables.

The first statement is not true because without having substantial main effects, it is possible to have a significant interaction effect. In other words, while the interaction effect may be responsible for group differences, each factor's independent impacts might not be particularly impactful by themselves.

A two-factor experiment has two independent variables in its experimental design. In other words, the researcher is experimenting with two different factors to observe how they effect the desired outcome. The amount of the drug and the time of day it is taken, for instance, could be the two independent variables in a study on the effects of a new treatment on blood pressure.

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Correct question:

1. If you reject the null hypothesis for the interaction in a two-factor ANOVA, you know that you will also reject the null hypothesis for at least one main effect. True or False

2. A two-factor experiment means that the experimental design includes:

a. two independent variables

b. two dependent variables

c. two groups of participants

No, the events A and B are not mutually exclusive.

Mutually exclusive events are events that cannot occur simultaneously, meaning that if one event happens, the other cannot happen at the same time. In this case, events A and B are not mutually exclusive because a student can be both at most 24 years old (event A) and at least 40 years old (event B) at the same time. It is possible for a student to fall into both categories if they are exactly 24 or 40 years old.

Therefore, events A and B are not mutually exclusive.

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Answer:

Step-by-step explanation:

it is 2x

The length of an arc is 12.5 cm.

To find the length of an arc, we need to first find the measure of each central angle. Since the circle is divided into nine equal central angles, we can use the formula:

measure of each central angle = 360 degrees / number of central angles

measure of each central angle = 360 degrees / 9

measure of each central angle = 40 degrees

Now, we can use the formula for the length of an arc:

length of an arc = (central angle in degrees / 360 degrees) x (circumference of the circle)

We know that the diameter of the circle is 35.7 cm, so the radius is half of that, or 17.85 cm. The circumference of the circle is:

circumference = 2 x pi x radius

circumference = 2 x 3.14 x 17.85

circumference = 112.15 cm

Now we can plug in the values:

length of an arc = (40 degrees / 360 degrees) x 112.15 cm

length of an arc = 0.1111 x 112.15 cm

length of an arc = 12.46 cm

Rounding to tenths, the length of an arc is 12.5 cm.

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The solution of the limits are

1. lim   3x/x²+2x + 3 = 0

2. lim (x²+x-6)/(x²-9) = 1

3. lim (x(x+1)-1)/x = ∞

4. lim (x(x+5)-3)/(x-4) = no limit

5. lim sin3x/x  = 3

6. lim sin4x/7x  = 4/7

7. lim ((h+4)² - 16)/h  = 0

8. lim 1-cos²x/x  = 0

1. lim 3x/x²+2x+3

To evaluate this limit, we substitute x with the value it approaches (in this case, infinity) and simplify the expression. We get:

lim 3x/x²+2x+3 = lim 3/x+2+3/x² As x approaches infinity, both terms approach zero. Therefore, the limit is equal to:

lim 3/x+2+3/x² = 0

2. lim (x²+x-6)/(x²-9)

To evaluate this limit, we can factor both the numerator and denominator and simplify the expression. We get:

lim (x²+x-6)/(x²-9) = lim (x-2)(x+3)/(x-3)(x+3) As x approaches 3, the denominator approaches zero. However, the numerator does not. Therefore, we can cancel out the (x+3) term in the numerator and denominator and evaluate the limit. We get:

lim (x-2)/(x-3) = 1

3. lim (x(x+1)-1)/x

To evaluate this limit, we can simplify the expression by expanding the numerator and canceling out the common terms. We get:

lim (x(x+1)-1)/x = lim x²+x-1/x As x approaches infinity, the expression approaches infinity as well. Therefore, the limit is equal to:

lim x²+x-1/x = infinity

4. lim (x(x+5)-3)/(x-4)

To evaluate this limit, we can simplify the expression by expanding the numerator and canceling out the common terms. We get:

lim (x(x+5)-3)/(x-4) = lim x²+5x-3/x-4 As x approaches 4, the denominator approaches zero. However, the numerator does not. Therefore, we can factor out the common term (x-4) from the numerator and denominator and evaluate the limit. We get:

lim (x²+5x-3)/(x-4) = lim (x-4)(x+9)/(x-4) As x approaches 4, the (x-4) term in the numerator and denominator approaches zero. However, the (x+9) term in the numerator does not. Therefore, the limit does not exist.

5. lim sin(3x)/x

To evaluate this limit, we can use the trigonometric identity:

lim sin(3x)/x = lim 3(sin(3x)/(3x)) As x approaches zero, the sin(3x)/(3x) term approaches 1. Therefore, the limit is equal to:

lim 3(sin(3x)/(3x)) = 3

6. lim sin(4x)/7x

To evaluate this limit, we can use the trigonometric identity:

lim sin(4x)/7x = lim 4(sin(4x)/(4x))/7 As x approaches zero, the sin(4x)/(4x) term approaches 1. Therefore, the limit is equal to:

lim 4(sin(4x)/(4x))/7 = 4/7

7. lim ((h(h+4)² - 16)/h

To evaluate this limit, we can simplify the expression by expanding the numerator and simplifying. We get:

lim ((h+4)² - 16)/h = lim (h² + 8h)/h As h approaches zero, the expression approaches zero as well. Therefore, the limit is equal to:

lim (h² + 8h)/h = 0

8. lim (1 - cos²(x))/x

To evaluate this limit, we can use the trigonometric identity:

1 - cos²(x) = sin²(x)

Therefore, we can rewrite the expression as:

lim (1 - cos²(x))/x = lim sin²(x)/x As x approaches zero, the sin²(x)/x term approaches zero as well. Therefore, the limit is equal to:

lim sin²(x)/x = 0

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Complete Question:

Evaluate:

1. lim   3x/x²+2x + 3

2. lim (x²+x-6)/(x²-9)

3. lim (x(x+1)-1)/x

4. lim (x(x+5)-3)/(x-4)

5. lim sin3x/x  

6. lim sin4x/7x  

7. lim ((h+4)² - 16)/h  

8. lim 1-cos²x/x  

The given simultaneous equations have the following solution:

x = -√13 - 1, y = (1 + √13) / 2

or

x = √13 - 1, y = (1 - √13) / 2

A n algebraic expression is an expression built up from constant algebraic numbers, variables, and addition, subtraction, multiplication, division and exponentiation by an exponent that is a rational number.

The given simultaneous equations are:

x²-9y-x=2y² - 12 ...(1)

x+2y-1=0 ...(2)

From equation (2), we can write x = 1-2y and substitute this value of x in equation (1):

(1-2y)² - 9y - (1-2y) = 2y² - 12

Expanding and simplifying the above expression, we get:

4y² - 8y - 11 = 0

Using the quadratic formula, we can solve for y:

y = [ -(-8) ± √((-8)² - 4(4)(-11))] / (2(4))

y = [ 8 ± √(208) ] / 8

y = [ 1 ± √13 ] / 2

We can use equation (2) to determine the values of x that correspond to the values of y now that we have them:

When y = (1 + √13) / 2:

x = 1 - 2y = 1 - 2(1 + √13) / 2 = -√13 - 1

When y = (1 - √13) / 2:

x = 1 - 2y = 1 - 2(1 - √13) / 2 = √13 - 1

Therefore, the solution to the given simultaneous equations is:

x = -√13 - 1, y = (1 + √13) / 2

or

x = √13 - 1, y = (1 - √13) / 2

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The value of ∝ is 25.03° (nearest to the tenth)

Equations with trigonometric functions that hold true for all of the variables in the equation are known as trigonometric identities.
These identities are used to solve trigonometric equations and simplify trigonometric expressions.

Here, is a right angle triangle with an angle ∝,

We can apply the trigonometric Formula in the right angle triangle,

tan ∝ = Opposite Side/Adjacent Side.

tan ∝ = 35/75

tan ∝ = 0.467

∝ = tan ⁻¹ (0.467)

∝ = 25.03°

Therefore, the value of ∝ is 25.03° (nearest to the tenth)

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To construct a confidence interval for the population mean, we can use the following formula:

Confidence interval = sample mean ± (t-value * standard error)

Where the standard error is calculated as the population standard deviation divided by the square root of the sample size.

In this case, the sample size is 39, the sample mean is 38, and the population standard deviation is 4.4.

First, we need to find the t-value for an 80% confidence level with 38 degrees of freedom (n-1). Using a t-table or calculator, we find that the t-value is 1.303.

Next, we can calculate the standard error as:

standard error = 4.4 / sqrt(39) = 0.703

Finally, we can plug in the values to the formula and get:

Confidence interval = 38 ± (1.303 * 0.703)

Confidence interval = 38 ± 0.916

The 80% confidence interval for the population mean is, therefore (37.084, 38.916). This means that we can be 80% confident that the true population mean falls within this range based on the sample of 39 tasks that were analyzed.

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