What is 512 written as a power of a number?

A. 9^2

B. 4^4

C. 2^9

D. 2^8

X varies directly as y. If x is 9 when y is 4, find x when y is 8. a) Write the variation. b) Find x when y is 8.

Bob spent $37.80, including tax, on a pair of jeans. How much did the jeans cost if there was 8% sales tax?

Ronald rolled a number cube 50 times. During these trials he rolled the number 5 a total of 7 times. Based on these trials, what is the probability of rolling a 5? Does this represent a theoretical or experimental probability? Explain.

The center of a circle is at (-2, - 7) and its radius is 6. What is the equation of the circle? A. (x-2) 2 + (y-7) 2=3 B. (x+2) 2 + (y+7) 2=3 C. (x+2) 2 + (y+7) 2=36 D. (x-2) 2 + (y-7) 2=36

Which of the following numbers is prime? 1 2 4 9

On Sarah's 16 GB flash drive, she can fit 16 video clips of about 1 GB each, two movies of about 8 GB each, or 4000 songs of about 4 MB each.

How are the graphs of f (x) = x2 and g (x) = - (x + 2) 2 - 4 related?

Karen and bill collect coins. Karen has x coins. Bill has 3 coins fewer than five times the number of coins Karen has.

Together Xavier, Yolanda, and Zachary have $4.44. if each person has the same amount, how much money does each person have?

Do 6 and 7 have any common factors