What is the circumference of a circle with a radius of 3 inches? Use 3.14 for pie

2 answers:

8 0

Answer: 18.84

First, the formula utilized to find the circumference of a circle is C=2πr.

So, C=2x3.14x3
2x3.14= 6.28
6.28x3= 18.84

zzz [600]3 years ago

4 0

Answer:

18.85

Step-by-step explanation:

1. Formula for finding circumference is C=2πr.

2. Plug in the numbers. C=2(3.14)(3)

3. Multiply. 2 x 3.14 = 6.28 6.28 x 3 = 18.84

4. Answer is 18.84 (or 18.85 if rounding)

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A study investigated the effectiveness of meditation training in reducing trait anxiety. The study evaluated subjects trait anxi

Setler79 [48]

Answer:

The 99% confidence interval for the population mean reduction in anxiety was (1.2, 8.6).

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 = 27 - 1 = 26

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 26 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.99}{2} = 0.995$ . So we have T = 2.7787.

The margin of error is:

$M = T\frac{s}{\sqrt{n}} = 2.7787\frac{6.9}{\sqrt{27}} = 3.7$

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 4.9 - 3.7 = 1.2.

The upper end of the interval is the sample mean added to M. So it is 4.9 + 3.7 = 8.6.

The 99% confidence interval for the population mean reduction in anxiety was (1.2, 8.6).

6 0

2 years ago

SOMEONE HELP, I HAVENT BEEN PAYING ATTENTION TO CLASS

andrew11 [14]

Uhhh yeah me neither!! 3.14 yes!!! it’s pie

3 0

3 years ago

Read 2 more answers

7.Find the lengths of the missing sides in the triangle. If your answer is not an integer, leave it in simplest radical form. Th

Fed [463]

Here a right angled triangle given. one angle with measure $45^o$ given. The three sides of the triangle given 4, x, y.

We have to find, the sides which is opposite, adjacent and hypotenuse here.

We know that the side opposite to right angle is always hypotenuse. So, hypotenuyse = y.

The side adjacent to the given angle $45^o$ is x. So, here adjacent = x.

The opposite side is opposite to the given angle. So, opposite = 4.

Now we will use SOHCAHTOA that is $sin(x) =\frac{Opposite}{Hypotenuse} , cos(x) =\frac{Adjacent}{Hypotenuse} , tan(x) =\frac{Opposite}{Adjacent}$ , where x is the angle given.