An office building is 20 feet taller than twice the height of a bank building. If the office building is 320 feet tall, how tall is the bank building?

What is the value of x in the following equation. -x ^3/2 = -27

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b