2. the average monthly temperature in a coastal city in the united states is periodic and can be modeled with the
equation y = −8 cos ((x − 1) / 6)) + 17.5, where y represents the average temperature in degrees celsius and
x represents the month, with x = 1 representing january.
a. write an equation that represents x as a function of y.
b. a tourist wants to visit the city when the average temperature is closest to 25° celsius. what
recommendations would you make regarding when the tourist should travel? justify your response.