Please help!! Pre-Calculus! All written questions; no multiple choice answers!! Please show work!

Questions 1 is attached below, questions 2 & 3 are typed out.

Question 2:

Find the fifth roots of 32(cos 280° + i sin 280°).

Question 3:

The position of an object at time t is given by s(t) = 7 - 14t. Find the instantaneous velocity at t = 7 by finding the derivative.