Quadratic equation for (1,7) (-5,103) (8,168)

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

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

How do you determine if an ordered pair is a solution to a given equation?