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3 years ago

9

The perimeter of an equilateral triangle is 63 in.

2 answers:

hoa [83]3 years ago

6 0

Answer:

Step-by-step explanation:just do 4x+3

Mashcka [7]3 years ago

4 0

Because it is an equilateral triangle, all three sides are the same length. Because of this, you need to divide 63/3 to find out the length of one side. 63/3=21. So this tells us that 4x+3=21. Now that we have the equation, we need to solve for x. To do this, subtract the 3 on both sides to get 4x alone. 21-3=18. So now we know that 4x=18. Now divide 4 on each side to get x alone. X= 18/4, which simplifies to 9/2. In decimal form, x=4.5.

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3 years ago

Read 2 more answers

16. A proportional relationship between the number of pounds of tomatoes (x) and the price in dollars (y) is graphed, and the or

kondaur [170]

The relationship being proportional means there is a value of k such that

... y = k·x

We are given the point (6 (pounds), 3 (dollars)), so we can write ...

... 3 dollars = k·6 pounds

Dividing by 6 pounds, we get

... (3/6) dollars/pound = k = $0.50/lb

Now, we can use x=1 pound to find the price (y),

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3 years ago

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Dmitrij [34]

Answer:

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Step-by-step explanation:

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2 years ago

A marketing research company desires to know the mean consumption of milk per week among people over age 30. They believe that t

Nitella [24]

Answer:

651 is the minimum number of people over age 30 they must include in their sample.

Step-by-step explanation:

We are given the following information:

Confidence level = 90%

Significance level = 10%

Maximum error = 0.09

Variance = 1.96

$\text{Standard Deviation} = \sqrt{\text{Variance}} = \sqrt{1.96} = 1.4$

Formula:

$\text{Error} = z_{critical}\dfrac{\sigma}{\sqrt{n}}$

Putting all the values,

$z_{critical}\text{ at}~\alpha_{0.05} = \pm 1.64$

$0.09 = 1.64\times \dfrac{1.4}{\sqrt{n}}\\\\n = (\dfrac{1.64\times 1.4}{0.09})^2 = 650.81 \approx 651$

651 is the minimum number of people over age 30 they must include in their sample.

7 0

3 years ago