Hi can i get the answers

What is the difference between the predicted value and the actual value

Aline has a slope of negative 1/4 the past two points -5/4 and 1 what is the equation of the line

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).