Please help!! Timed would mean a lot to me

The depreciation per unit for a company

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 the value of x in the equation 2(x-4) = 4(2x + 1)?