ANSWER:
sorry i tried my hardest to find the answer but i couldn't.
A=12 so B is the variable while C is the solution.
C= 12xb
Or you can rearrange it as long as it plugs in together.
Answer:
<h2>(2)</h2>
Step-by-step explanation:
Because
not 
This follows from the formula 
0.63=63/100 and you cannot simplify it anymore