Is the answer a, b, c, or d?? Please help!!

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

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

How do you find principle and simple interest