What is the range of these numbers: 79 72 78 -71 -91 65

Ifurniture stores having a weekend sale and is offering 20% discount on patio chairs and table the sales tax on furniture is 6.25 using function composition how can you represent the total amount a that you would need to pay for this furniture that cost x dollars

It says factor each expression 49x-28?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2