Pre calc help please

Question

a pendulum at rest is hit to put it in motion. the distance the pendulum is from its resting position is given by the function f(t)=3e^-t/4 sin(4t), t≥0 in which t is measured in seconds and f(t) is measured in millimeters. How far is the pendulum from its reating position after 3 seconds?

Answer 1

For this solution, I graphed it. When t=3, y = -0.76 ft