The answer is 1.
1² = 1
20×1² = 20×1
Answer:
a: 
Step-by-step explanation:

Expand:



Subtract:

3 and 1/2 can be rewritten as a fraction as 7/2.
7 can be written as 7/1.
When dividing by a fraction, simply multiply by the reciprocal.
7/2*1/7.
Then, cross multiply across the top.
7*1=7
2*7=14
So it's 7/14, which can be reduced to 1/2.
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