SOLUTION: if 5 to the second power times 5r equals 225, what is r?

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Question 399104: if 5 to the second power times 5r equals 225, what is r?

Answer by algebrahouse.com(1659) About Me  (Show Source):
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5^2(5r) = 225
25(5r) = 225 {took 5^2 to be 25}
125r = 225 {multiplied 35 by 5}
r = 1.8 {divided both sides by 125}
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