calculus

A model for the length of daylight (in hours) in Philadelphia on the tth day of the year is
L(t) = 12 + 2.8 sin 2π/365(t − 80)

.
Use this model to compare how the number of hours of daylight is increasing in Philadelphia on April 21 and June 5. (Assume there are 365 days in a year. Round your answers to four decimal places.)
April 21 L'(t) =

June 5 L'(t) =

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  1. I took the first derivative and plug in April 21 = 111, and June 5 = 156 in t. got 0.0482 but its not correct

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  2. Assuming April 21 ----> 111
    L(111) = 12 + 2.8 sin 2π/365(111 − 80)
    = 12 + 2.8 sin 2π/365(31)
    = 13.424...

    did you set your calculator to radians?

    But whatever setting, you should have known that 0.0482 was wrong
    since sin(anything) lies between -1 and +1
    then 2.8 sin 2π/365(t − 80)
    must lie between -2.8 and 2.8
    and when 12 is added to that, the only answers possible are those between 9.2 and 14.8

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    Reiny

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