sinusoidal equation

**dan123** · May 31st 2009, 05:22 PM

in prince albert,the sun rises at 9:17 on december 21 and 4:35 on june 22. because there is no daylight savings time,the time the sun rises on any other date can be predicted from a sinusoidal graph with a period of 365 days.

write an equation that relates to the time the sun rises to the day of the year,and remember to show your work

**pickslides** · May 31st 2009, 06:23 PM

your equation is in the form

$T = Asin (n(d-B)) + C$

$n = \frac{365}{2\pi}<br />$

where d = day number and T is time of sunrise

you can use the points (172,9:17) & (355,4:35)

do you have any other information?

**dan123** · May 31st 2009, 06:52 PM

no,thats all they have given me,which is why i am stumped

**pickslides** · May 31st 2009, 07:15 PM

maybe disregard B to give

$T = Asin (n(d)) + C$ then sub in points to find A & B.

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