Need these done asap or ima get sent away

Which statement about the graph of y = 8(0.25)^2

What is the length of the unknown leg in the right triangle ?

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