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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 percent of 18 is 24? and plz explain thx.

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air