Is the value of y in the product of powers below 8^3

Can someone me i’m confused. will give brainliest and a whole bunch of points

Can someone me out here number 4 plz

The motion of a weight that hangs from a spring is represented by the equation h=8sin(2pi/3t). it models the weight’s height above or below the rest position as a function of time. approximately when will the object be 3 inches above the rest position?