45x4-(6) im trying to figure it out but I just can't

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.