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2 years ago

The circumference of a circle is given by the formula C = 2 πr Find r if the circumference is 88 meters and π is 22/7

Mathematics

2 answers:

True [87]2 years ago

5 0

Answer:

radius= 1.272727 meters.

Step-by-step explanation:

We have given the circumference of a circle :

C = 88 meters.

We have to find the radius of circle.

We know the formula of circumference that is:

C = 2πr

Here C =88 and π = 22/7.

Putting these values in above formula we get,

88 = 2(22/7)r

88 = (6.285714)r

r = 88/ (6.285714)

r= 1.272727 meters.

Viefleur [7K]2 years ago

3 0

Answer: 1.27 m

Step-by-step explanation:

To solve this problem you onlly need to solve dor the radius from the formula of the circumference given in the problem above, as you can see below:

$C=2r\pi \\r=C/2\pi$

Substitute values into the formula, therefore you obtain that the radius of the circle is the shown below:

$r=\frac{8m}{2*\frac{22}{7}}\\r=1.27m$

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3 years ago

In ΔQRS, the measure of ∠S=90°, SR = 7, QS = 24, and RQ = 25. What is the value of the tangent of ∠Q to the nearest hundredth?

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2 years ago

HELP ME PLEASE!!!!!!!!!!!!!!!!

Pepsi [2]

The ordered pairs of the solution to the system of equation are [(3, 6), (-3, 18)]

<h3>System of equations</h3>

Given the following system of equations expressed as:

f(x) = x² - 2x + 3 and f(x) = -2x + 12

Since they are both function of x, hence;

x² - 2x + 3 = -2x + 12

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2 years ago

A researcher is going to estimate the average typing speed of students of a college. He selects a random sample of 20 students a

Stella [2.4K]

Answer:

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 20 - 1 = 19

90% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.9}{2} = 0.95$ . So we have T = 1.7291

The margin of error is:

$M = T\frac{s}{\sqrt{n}}$

In which s is the standard deviation of the sample and n is the size of the sample. For this question, we have $s = 5, n = 20$ . So

$M = T\frac{s}{\sqrt{n}}$

$M = 1.7291\frac{5}{\sqrt{20}}$

$M = 1.933$

The margin of error of the 90% confidence interval of a student's average typing speed is of 1.933 wpm.

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frosja888 [35]

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