How do I write a sin trigonometric function from a table

Question

 Write a trigonometric function that models the monthly attendance at the museum using x=1 to represent January 

Month:     Jan  Feb  Mar  Apr  May  Jun  Jul  Aug 

Visitors:   10    8     11   15    24    30    32  29

Answer 1

-1.89753*sin(x) + 8.87461*cos(x) + 19.8719

 

 

 

http://www.wolframalpha.com/widgets/view.jsp?id=a96a9e81ac4bbb54f8002bb61b8d3472

choose trigonometric model and input the data as ordered pairs

{1,10},{2,8},{3,11},{4,15},{5,25},{6,30},{7,32},{8,29}

 

you can copy and paste the input from the line above