What is the radius of the circle whose area is numerically 5 times greater than its circumference?

a) 5
b) 10
c) 4 pi
d) 2 pi
e) pi

the answer is 10, why?

If $740 is invested at an interest rate of 11% per year and is compounded continuously, how much will the investment be worth in 7 years? use the continuous compound interest formula a = pert.

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?

What is the scale factor of axyz to auvw?