Practice using derivatives in a variety of different fields.
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Problem

The day length, in minutes, of the n, start superscript, t, h, end superscript day of the year in Juneau, Alaska, is given by the following function:
D, left parenthesis, n, right parenthesis, equals, 357, cosine, left parenthesis, 0, point, 02, n, minus, 2, point, 9, right parenthesis, plus, 740
What is the instantaneous rate of change of the day length on the 20, start superscript, t, h, end superscript day of the year?
Please choose from one of the following options.
In what units is this rate of change measured?
Please choose from one of the following options.