Question

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Answer 1

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%