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Mathematics 46 Online
OpenStudy (anonymous):

Racing cyclists use the function r(x)=4 sqrt x to determine the maximum rate,r(x) , in miles per hour, to turn a corner of radius x, in feet, without tipping over. What is the maximum rate a cyclist should travel around a corner of radius 18 feet without tipping over? Leave the solution in simplified radical form. a. 16 sqrt 2 mph b. 16 + sqrt 2 mph c. 4(4+ sqrt 2) / r mph d. 12 sqrt 2 mph

OpenStudy (apoorvk):

plug in x=18 in the equation. simple enough. what do you think?

OpenStudy (jlastino):

A follow up, you can simplify a square root of something by expressing it as a product of two numbers

OpenStudy (jlastino):

d. 12 sqrt 2 mph

OpenStudy (apoorvk):

hmm yeah D.

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