Estimate the solution of the system of equations

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

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie