Solve for b_15
b_{15}=16200
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8100=\frac{1}{2}b_{15}
Calculate 90 to the power of 2 and get 8100.
\frac{1}{2}b_{15}=8100
Swap sides so that all variable terms are on the left hand side.
b_{15}=8100\times 2
Multiply both sides by 2, the reciprocal of \frac{1}{2}.
b_{15}=16200
Multiply 8100 and 2 to get 16200.
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