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Need help with number 1

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

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax

Add the two expressions 4.6 x -3 + -5.3 x + 9