All categories

2 years ago

If the area of a circle is 121pi square units, what is its diameter

1 answer:

4 0

The area of a circle is A = r^2pi
Since the area is equal to 121pi the equation would be, 121pi = r^2. To find r in terms of pi take the square root of 121, to find the radius. Then multiply that by two to get the diameter.

You might be interested in

The length of a piece of lumber is 6.5 meters. How many centimeters is this?

patriot [66]

650 cm when you convert it that is what i got it is correct

4 0

2 years ago

Read 2 more answers

Please help????????????? (ASAP)

Rina8888 [55]

Answer: 12

Step-by-step explanation:

$\frac{b}{3}+16=20$

Subtract 16

$\frac{b}{3}=20-16$

$\frac{b}{3}=4$

Multiply by 3

$b=4*3$

$b=12$

8 0

3 years ago

If x=3, Solve, -3x +4 *

eduard

Answer:

-5

Step-by-step explanation:

3x -3 = -9 + 4 = -5

3 0

2 years ago

Read 2 more answers

PLS help timed! which graph represents the solution of y<x2-1 and x>y2-3?

miv72 [106K]

Answer:

y minus 3 = 2x plus 1

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

A survey showed that 77% of adults need correction (eyeglasses, contacts, surgery, etc.) for their eyesight. If 22 adults are

Sveta_85 [38]

Answer:

The probability that no more than more than 11 of them need correction for their eyesight is 0.00512

No, 11 is not a significantly low low number of adults requiring eyesight correction .

Step-by-step explanation:

A survey showed that 77% of adults need correction for their eyesight.

If 22 adults are randomly selected, find the probability that no more than more than 11 of them need correction for their eyesight.

n =22

p = 0.77

q = 1-p = 1- 0.77=0.23

We are supposed to find $P(x\leq 11)$

$P(x\leq 11)=P(x=1)+P(x=2)+P(x=3)+.....+P(x=11)$

Formula : $P(x=r)=^nC_r p^r q^{n-r}$

$P(x\leq 11)=^{22}C_1 (0.77)^1 (0.23)^{22-1}+^{22}C_2 (0.77)^2 (0.23)^{22-2}+^{22}C_3 (0.77)^1 (0.23)^{22-3}+.....+^{22}C_{11} (0.77)^1 (0.23)^{22-11}$

Using calculator

$P(x\leq 11)=0.00512$

So, The probability that no more than more than 11 of them need correction for their eyesight is 0.00512

No, 11 is not a significantly low low number of adults requiring eyesight correction .

3 0

3 years ago