Math, Trigonometry

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daylight in Calgary, AB each month is show in the table below.?

Month Daylight (hrs)
Jan 8.50
Feb 10.03
March 11.91
April 13.87
May 15.57
June 16.48
July 16.03
Aug 14.51
Sept 12.63
Oct 10.68
Nov 9.20
Dec 7.99

a) Determine the regression equation that models the number of daylight hours each month.

b) What does the "d" value indicate in the regression equation in regards to this scenario? (explain what is means)

c) What days of the year have 11 hrs of daylight?

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