Homework Help: calculus

Posted by Anonymous on Sunday, April 5, 2009 at 8:58pm.

The number of hours of daylight D depends upon the latitude and the day t of the year and is given by the equation :
D(t)=12+Asin(((2pi)/(365))(t-80))

where A depends only on the latitude (and not t). for latitude 30 degress, A is about 2.3

1. When is the number of hours of daylight the greatest?
2.When is the number of hours of daylight the least?
3. When is the number of hours of daylight increasing at a rate of 2 minutes per day?
4. when is the number of hours of daylight decreasing at a rate of 2 min per day?

Can any one help me with any of these?
thanks a lot!

calculus - bobpursley, Sunday, April 5, 2009 at 9:05pm
repeat. I forgot on the last post, on 4 set dD/dt to minus 2/60.
calculus - Anonymous, Sunday, April 5, 2009 at 9:29pm
thank you so much I appreciate this

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