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11. Please solve this! Thanks!!

Mathematics
Tutor: None Selected Time limit: 0 Hours

Apr 6th, 2015

r(d) = d+90.43 / 6.97

r(d(r)) = 6.97r -90.43+90.43 / 6.97 = 6.97r/6.97 = r   check

d(r(d)) = 6.97(d+90.43 / 6.97) - 90.43 = d+90.43-90.43 = d  check

Apr 5th, 2015

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Apr 6th, 2015
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Apr 6th, 2015
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