Answer
$32+24+18+13.5+10.125=\displaystyle \sum_{n=1}^{5}32(0.75)^{n-1}$
Work Step by Step
$10.125=32(0.75)^4$
$32+24+18+13.5+10.125=32(0.75)^0+32(0.75)^1+32(0.75)^2+32(0.75)^3+32(0.75)^4=\displaystyle \sum_{n=1}^{5}32(0.75)^{n-1}$
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