Pllz answer if you know 30 points the normal monthly temperatures (°f) for omaha, nebraska, are recorded below.
month jan feb mar apr may jun jul aug sep oct nov dec
t 1 2 3 4 5 6 7 8 9 10 11 12
temp. 21° 27° 39° 52° 62° 72° 77° 74° 65° 53° 39° 25°

a. write a sinusoidal function that models omaha’s monthly temperature variation.
b. use the model to estimate the normal temperature during the month of april.