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December 21, 2014

December 21, 2014

Posted by **Kelvin** on Thursday, March 31, 2011 at 11:48am.

36.write an expression for the total time for the round trip.

37.write your answer to exercise 36 as a single rotional expression.

28.use your answer to exercise 37 to find how long the round trip will take if the boat travels 10kilometers per hour through still water

- Algebra(urgent) -
**Reiny**, Thursday, March 31, 2011 at 12:09pmtime upstream = 24/(x-2)

time downstream = 24/(x+2)

total time = 24/(x-2) + 24/(x+2)

common denominator is (x+2)(x-2)

so total = (24(x+2) + 24(x-2))/((x+2)(x-2))

= 48x/(x^2 - 4)

Plug in x=10

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