SOLUTION: Hello, I need help on this question please : A Canada Post outlet in small Alberta town found that the number of pieces of mail received per week, m, can be modelled by the fun

Question 1072934: Hello, I need help on this question please :
A Canada Post outlet in small Alberta town found that the number of pieces of mail received per week, m, can be modelled by the function
m (t) = 3200 cos(0.72 t - 1.15) + 6400
Where t is the number of years since January 1,2005
For how many of the first 10 years, to the nearest tenth of a year did the Canada Post outlet receive fewer than 6600 pieces of mail per week?
This falls within trigonometry function and graphing. I tried the question by plugging in 10 for t and 6600 for m(t) and got 0.7
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
No, you need to find when the value of the function was less than 6600.

So find the times when the value of the cosine function is equal to 0.0625,

and

.
.
.

.
.
.
.
So between t=3.7 years and t=8.2 years, the number of pieces of mail fell below 6600.
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