Question

I am working on my final assignment,
basically i have to compare the temperature of two cities (monthly)...
I just want you guys help with one city ..

the temperatures for the first city are:
-11
-7
2
21
36
48
51
45
34
16
-2
-8

period: 12 months
midline: 24.5 unsure!!!
amplitude 26.5 is that correct?

I have to find a trigonometric model using the cosine and sine function;
and then i have to find the period, amplitude, midline and range..
please help me.
ps: please tell me about the horizontal shift in the sine function.