(2x^3+4x^2+1)+(x3-x^2-4) in standard form

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

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

Find the axis of symmerty for x y=x squared -4x-8