By switching service providers, a family's telephone bill decreased from about $50 a month to about $47.
what was the percent decrease?

Which represents the solution set of the inequality 5x-9 < 21? a. x < 12/5 b. x > 12/5 c. x > 6 d. x < 6

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

You need to solve a system of equations. you decide to use the elimination method. which of these is not allowed? 3x - 2y = 7 3x + 4y = 17 equation 1 equation 2