Pleasae me with this i am struggling

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).