Lori Cook has developed the following forecasting model:

^Y=40.0 + 4.20x,

where ^Y = demand for Kool Air conditioners and

x = the outside temperature (degrees Fahrenheit)

a) When the temperature outside is 70 degrees F, demand forecast = ___ air conditioners (enter your response as an integer).

b) When the temperature outside is 80 degrees F, demand forecast = ___ air conditioners (enter your response as an integer).

c) When the temperature outside is 90 degrees F, demand forecast = ___ air conditioners (enter your response as an integer).