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3 years ago

Find the value of the circumference of a circle with the given diameter.

1 answer:

7 0

C= 2πr, and 2r = D (diameter). So, you can also use this equation: C =Dπ
Since we know the diameter, and we know the value of π, we can easily calculate the value of circumference.
C = Dπ
C = 3.21π
This means that the correct answer is B. 3.21 pi

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A painter needs to buy a ladder in order to paint a wall that is 18 feet high. In order to ensure the ladder does not fall it ne

trapecia [35]

Answer:

222! thats your answer!

Step-by-step explanation:

6 0

3 years ago

Daniel runs laps every day at the community track. He ran 45 minutes each day, 5 days each week, for 12 weeks. In that time, he

gizmo_the_mogwai [7]

1800 laps in 12 weeks

1800/12 = 150 laps in 1 week

150/5 = 30 laps a day

30 laps in 45 minutes

x laps in 60 minutes

x = (30*60)/45 = 40 laps per hour

5 0

3 years ago

Answer the following questions.

SOVA2 [1]

Answer:

Step-by-step explanation:

5 0

3 years ago

Two college roommates have each committed to donating to charity each week for the next year. The roommates’ weekly incomes are

schepotkina [342]

Answer:

C. 5 weeks.

Step-by-step explanation:

In this question we have a random variable that is equal to the sum of two normal-distributed random variables.

If we have two random variables X and Y, both normally distributed, the sum will have this properties:

$S=X+Y\\\\\ \mu_S=\mu_X+\mu_Y=30+60=90\\\\\sigma_S=\sqrt{\sigma_X^2+\sigma_Y^2}=\sqrt{10^2+20^2}=\sqrt{100+400}=\sqrt{500}=22.36$

To calculate the expected weeks that the donation exceeds $120, first we can calculate the probability of S>120:

$z=\frac{S-\mu_S}{\sigma_S} =\frac{120-90}{22.36}=\frac{30}{22.36}=1.34\\\\P(S>120)=P(z>1.34)=0.09012$

The expected weeks can be calculated as the product of the number of weeks in the year (52) and this probability:

$E=\#weeks*P(S>120)=52*0.09012=4.68$

The nearest answer is C. 5 weeks.

6 0

3 years ago

Need help please on this one

OverLord2011 [107]

Answer: 3/2

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Explanation:

Pick any two points on the red line. I'll pick (0,1) and (2,4)

Those coordinates will be plugged into the slope formula below

m = (y2 - y1)/(x2 - x1)

m = (4 - 1)/(2 - 0)

m = 3/2

This means we go up 3 and over to the right 2 when traveling along this red line.

8 0

2 years ago