SOLUTION: (1+r)/(9+r)=3/4

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Question 831280: (1+r)/(9+r)=3/4
Answer by erica65404(394) About Me  (Show Source):
You can put this solution on YOUR website!
%281%2Br%29%2F%289%2Br%29=3%2F4
Cross multiply.
4%281%2Br%29=3%289%2Br%29
4%2A1+%2B+4%2Ar+=+3%2A9%2B3%2Ar
4r%2B4=3r%2B27
4r=3r%2B23
r=23
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