Help I’m bad at math

Two numbers have a sum of -19. one number is x. what expression represents the other number?

How many zeros does this polynomial function, y=(x-8)(x+3)^2

Acredit union pays 5% annual interest, compounded daily, on saving deposits. find the value after one year of $500 deposited in this account. a-$20.40 b-$25.64 c-$520.40 d-$525.64