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Trigonometry
Someone please help me!!! I think I've found the correct formula for this but I don't understand exactly why this is a sine function and how to find the days of the year when Portland has 11 and 15 hours of daylight. PLEASE HELP!!
asked by french accent on February 26, 2018 
MATH PROBLEM
One revolution of the Sun by the Earth requires 365 days, 5 hours, 48 minutes and 49.7 seconds. the 5 hours, 48 minutes and 49.7 second is approximated to 1/4 of a day. Every 4th year, one full day is added( leap year). How much
asked by Kim on January 16, 2013 
Math
The number of daylight hours in a day is harmonic. Suppose that in a particular location, the shortest day of the year has 7 hours of daylight and the longest day of the year has 18 hours. Then, we can model its motion with the
asked by Doug on September 28, 2009 
Trigonometry
The number of daylight hours in a day is harmonic. Suppose that in a particular location, the shortest day of the year has 7 hours of daylight and the longest day of the year has 18 hours. Then, we can model its motion with the
asked by Doug on September 28, 2009 
math
In Philadelphia the number of hours of daylight on day t (where t is the number of days after Jan. 1) is modeled by the function L(t)= 12+2.83sin(2pi/365(t365)) A) Which days of the year have about 10 hours of daylight? B) Which
asked by jessica on August 13, 2011 
Trignometry
In Philadelphia the number of hours of daylight on day t (t is the number of days after january 1) is modeled by the function L(t)= 12+2.83sin((2*Pi)/365(t800) a. Which day have about 10 hours of daylight? b. How many days of the
asked by SAM on April 15, 2017 
Pre Calculus HELP!?
The length of a day in Philadelphia, Pennsylvania, is given by the sinusoidal function, f(t), which represents the number of hours of daylight t days into the year: f(t)= 10+2.8sin(2pi/365)*(t1.35). How many hours of daylight are
asked by Ellie on November 26, 2015 
Calc..Help Please
A model for the length of daylight (in hours) in Philadelphia on the t th day of the year is L(t)= 12+2.8 sin[2pi/365(t80)] Use this model to compare how the number of hours of daylight is increasing in Philadelphia on March 21
asked by Nurcan on February 20, 2012 
PreCalculus HELP!!
The length of a day in Philadelphia, Pennsylvania, is given by the sinusoidal function, f(t), which represents the number of hours of daylight t days into the year: f(x)=11+2.2sin(2pi/365)t1.25).How many hours of daylight are
asked by Ellie on November 26, 2015 
Trigonometry
Someone please help me!!! I think I've found the correct formula for this but I don't understand exactly why this is a sine function and how to find the days of the year when Portland has 11 and 15 hours of daylight. PLEASE HELP!!
asked by french accent on February 27, 2018 
astronomy/conversion
There are 365.25 days in a year, 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute. Convert years into seconds. Show your work and keep 5 significant figures. Ok, so finding it is easy (multiply 24, 60, 60 and
asked by carl on January 17, 2013