What is the excat value of the circumference of the circle whose radius is 8.5

53.407075111

Step-by-step explanation:

area = pi x diameter

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

what i would say the best answer is a. 40.5