Question

solve this please it is urgent, this two questions​

Answer 1

Answer:

21.

1.2 × 10^3

2.4 × 10-4

=1.2×10^3×2.4×10^4

= 2.88 × 10^7 is your required answer

22.

4y(2y-6)-3(y-2)+20

put y=-1

4(-1){2(-1)-6}-3{(-1)-2}+20

-4{-2-6}-3{-1-2}+20

-4{-8}-3{-3}+20

32+9+20

=61 is your required answer

Step-by-step explanation:

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