Answer:
a) 0.0137060668
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I not know b part.
A/Wall if you have 20 and 30 that box is missing # so you will need to times and you will get something like this 20×30=60 and that's the missing #
B/Its going to be about 768 so you need to times and if you don't get 768
No solution.
Step-by-step explanation:
1) Simplify 2 + 2 to 4.
2) Simplify 4 + 5 to 9.
3) Since 9 = 0 is false, these is no solution.
You can use a calculator online you know? It is 21.3