Which function of x has a y-intercept of -5?

For how answer my question this will be the last question can you answer in math subject

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

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180