You'll apply the geometric mean formula. The idea is to multiply the two pieces of the hypotenuse: 5*11 = 55
Then apply the square root to get sqrt(55)
The exact answer in terms of radicals or square roots is sqrt(55)
Using a calculator, the approximate answer is sqrt(55) = 7.416198
If your teacher wants you to use a proportion, then one way to do it is to have 11/y = y/5 11*5 = y*y 55 = y^2 y^2 = 55 y = sqrt(55) y = 7.416198 approximately
But if she went back to the ocean and back home 66 times why doesn't she have 66 time trials instead of only 7? anyways it wouldn't even be possible for her to have a goal of averaging 52 minutes. :/
