Question

Send all sums step by step
Will get mark of brainly

Answer 1

Answer:

For #16

answer=56x²+41xy+52xy-31y²+75y²+9+15

=>56x²+93xy+44y²+24

For #17

answer=(5a+7a-3a-3b+2b+6b+7-7-9)

perimetre=9a+5b-9

For #18

a)-1

b)3

c)5

d)-2(only answers)

For #19

answer=a)7

b)2

For #20

answer=>9^4=3^x

=>{(3)²}²=3^x

=>2×2=x

For #21

answer=(13)²====(13×13)

I hope this will help u