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13 is odd ,so (-1)¹³ is -1
17) -1×32×8=-256
18)-7xy-3y²+2x²+3x²-4y²-6xy= 5x²-7y²-13xy.
19)s²=900=>s=30
peimeter=4×s=>4(30)=120cm.
20)S.I=PTR/100
=7500×6×2/100
=75×12=900.
21)no clarity sorry
22)24/50*100=48%
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