Answer:
16: 24ab, a negative times a negative always makes a positive by the way
17: 6x^4
18: 15, 15-8=7, then 7x3=21
19: -2x+8
20: 8a
21: y x y x y
22: 2a+3b
23: 6a^4
24: x times x times x times x
25: 49y^2
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