Hello, yoman360!

Here's the first part . . .

We have: ..is the position vector

. . from the origin to a moving point at time

a. A single equation in and for the path of the point is:

Square [1] and [2]: .

. . . . . . .Add: . .

. . . . . . . . . . . .

Multiply by 36: . . . . answer {E}