The table shows the highest daily temperature in degrees Fahrenheit averaged over the month for Cosine City, where m is the number of months since January 2001. (m = 0 represents January 2001.)
The following should help:
Would that mean the amplitude is 24 and the vertical shift is 62? Then what would the period be?
A is the amplitude, which is half the vertical distance between the peak (86) and the trough (38).
The period, T, is 12 months.
The vertical shift is the y-value about which the sine curve oscillates i.e. it is the "middle" of the curve in the vertical direction.
The offset angle of pi is there because the function starts going in the negative y-direction rather than positive y-direction.
Does this help?