Solve for k
k=\frac{9}{160}=0.05625
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90=k\times 1600
Calculate 40 to the power of 2 and get 1600.
k\times 1600=90
Swap sides so that all variable terms are on the left hand side.
k=\frac{90}{1600}
Divide both sides by 1600.
k=\frac{9}{160}
Reduce the fraction \frac{90}{1600} to lowest terms by extracting and canceling out 10.
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