I'm not 100% sure which one it is, can someone

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Which of the functions below could have created this graph?

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).