One pump can fill a swimming pool in 8 hours and another pump can fill it in 10 hours. If both pumps are opened at the same time, how many hours will it take to fill the pool?

Why does changing a subrtraction problem to an addition with the complement of 9 work

Most ATM's require a 4-digit code using the digits 0-9 how many 4-digit codes can you use

What do you need to know?

Kira measures the round temperature dial on a thermostat and calculates that it has a circumference of 13.188 centimeters. What is the dial's radius?

Factor completely 36x^2-25

What is 12/39 in simplest form

Find three consecutive even integer with the sum of - 84

F (x) = 2x^3 + 6 G (x) = - 4x-1

Complete the square t^2-8t+10

A bag contains 4 red chips and 2 blue chips. another bag contains 2 red chips and 6 blue chips. A chip is randomly selected from one bag and it is blue. What is the probability that it came from the first bag