s and s inv 4 and 5 ace help edited 10/19

NEW:
s and s inv 5 ace 13
s and s inv 5 ace 23 and 24

Inv 5.1 review:
s_and_s_inv_5.1_review

inv 5 ace help:
s_ans_s_inv_5_ace_3_9_and_25
s_and_s_investigation_5_37
s_and_s_investigation_5_ace_36_and_38

Inv 4 ace:
s and s inv 4 ace 3 and 4
s and s inv 4 ace 28
s and s inv 4 ace 37
s and s inv 4 ace 38