Abookstore had 80 copies of a magazine. yesterday, it sold 2/5 of them. today, it sold 1/4 of what remained. how many copies does the bookstore have left?

What is the product of the radical expression. (7-2square root) (8+2 square root)

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?