Can anyone answer theese ill offer alot of points for it

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

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?