Need answers please.

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

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

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.