Contraction word doesnt describe by two words

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