Help me please and thanks

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

What is not true about kl and mn? what is mn? (show your work)

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b