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3 years ago

Find the circumference of the circle with the given radius or diameter. (Use 3.14 for it) r=20

Mathematics

2 answers:

Margarita [4]3 years ago

6 0

Answer:

$\huge\boxed{C\approx125.6}$

Step-by-step explanation:

The formula of a circumference of a circle:

$C=d\pi=2\pi r$

d - diameter

r - radius

We have the radius r = 20.

Substitute:

$C=2\pi(20)=40\pi$

use π ≈ 3.14

$C\approx(40)(3.14)=125.6$

iogann1982 [59]3 years ago

4 0

Answer:

C = 2πr = 2 * 3.14 * 20 = 125.6

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What is the degree of the polynomial? 4x3+3x2−9x+7

PolarNik [594]

Answer:

Step-by-step explanation:

The highest degree amount or exponet amount is the power of a equation.

3 is the highest exponet so it is 3.

7 0

3 years ago

The mean height of married American women in their early twenties is 64.5 inches and the standard deviation is 2.5 inches. The m

SSSSS [86.1K]

Answer:

The equation for regression line and predicting a husband's height for married couples in their early 20s

Equation: Y'=33.67+0.54*X'

Step-by-step explanation:

r=0.5

x'=64.5

Sx=2.5

y'=68.5

Sy=2.7

General regression line equation is:

Y'=a+b*X'

so the slope of the regression line is the linear correlation coefficient multiplied by the standard deviation for y' divided by the standard deviation for x'

$b=r*\frac{S_{y}}{S_{x}}\\b=0.5*\frac{2.7}{2.5}\\b=0.54$

The intercept with axis y is the mean of the decreased by the product of the slope and the mean of x

$a=y'-b*x'\\a=68.5-0.54*64.5\\a=33.67$

The equation regression line then is:

Y'=33.67+0.54*X'

4 0

3 years ago

What is the volume of a cylinder with base radius 2 and height 9?

astraxan [27]

113.04 is the volume

V = pi x r^2 x h

3.14 x 2^2 x 9 = 113.04

8 0

3 years ago

Application of Geometric Series

Gnoma [55]

Answer:

7.2224

Step-by-step explanation:

The value of the summation is given by the formula ...

Sn = (a1)(1 -r^n)/(1 -r) . . . . . where a1 is the first of n terms, and r is the common ratio.

Your sum has first term and ratio ...

a1 = 2(0.6) . . . . . summation term for n=1

r = 0.6

So the sum is ...

$\displaystyle \sum_{n=1}^4{2(0.6^n)}=2(0.6)\dfrac{1-0.6^4}{1-0.6}=\dfrac{1.2}{0.4}(0.8704) = 2.6112$

Then the value of the entire given expression is ...

$\displaystyle 2+2\sum_{n=1}^4{}2(0.6^n)=2+2(2.6112)=\boxed{7.2224}$

_____

A calculator can help you find the value.

6 0

2 years ago

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KIM [24]

Answer:

B. Arithmetric

Step-by-step explanation:

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3 years ago