The hours of daylight, y, in Utica in days x from January 1, 2013 can be modeled by the equation y = 2.89sin(0.0145x-1.40) + 10.99. How many hours of daylight, to the nearest tenth, does this model predict for February 21, 2013?

9.3 hours

Step-by-step explanation:

Given

Required

Hours of sunlight on Feb 21, 2013

First, calculate the number of days from Jan 1, 2013 to Feb 21, 2013

So:

So, we have:

--- approximated

a² + b²= c²

24² + 7² = c²

c= 25

the answer is d. 75%