FFPC inv 4 ace help

ffpc inv 42 wu

ffpc_inv_4_prob_4_part_1
ffpc_inv_4_prob_4_part_2_(and_5)
ffpc_inv_4_prob_9_(all)_and_10_(start)

Page 235-237 quadratic flight problems

I have included detailed videos on problems 17 and 20, a quick explinationof 21, and the answers for 22-23.
problem 17:

p._235_17
problem 20-23:
p_236_20_to_23