Create a fifth-degree polynomial with three terms in standard form

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

5500 dollars is placed in an account with an annual interest rate of 6.5%. to the nearest tenth of a year, how long will it take for the account value to reach 19700 dollars?

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)