SOLUTION: The height, h, in metres, of a car above the ground as a Ferris wheel turns can be modeled using the function h=15cos(pi*t/120) + 18. Estimate a value for the instantaneous rate

Question 199446: The height, h, in metres, of a car above the ground as a Ferris wheel turns can be modeled using the function h=15cos(pi*t/120) + 18.
Estimate a value for the instantaneous rate of change of h at t=20 s (answer is -0.196 m/s). Please show the work involved!!! Thanks in advance!
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Use this URL --> http://www44.wolframalpha.com/input/?i=15cos(pi*t%2F120)+%2B+18
Scroll down to the derivative section and click "Show steps". This will show you how to get the formula for the instantaneous rate of change (derivative). Now plug in t=20 to that and see what you get. :)

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