Lori Cook has developed the following forecasting model:

where hat$(y)=$ demand for Kool Air conditioners and

$x=$ the outside temperature $($degrees Fahrenheit$)$

a$)$ When the temperature outside is $70F,$ demand forecast $=$

air conditioners $($enter your response as an integer$).$

b$)$ When the temperature outside is $80F,$ demand forecast $=$

air conditioners $($enter your response as an integer$).$

c$)$ When the temperature outside is $90F,$ demand forecast $=$

air conditioners $($enter your response as an integer$).$