The ozone level (in parts per billion) on a summer day in a certain metropolitan area is given by P(t)=110+18t-21, where t is time in hours and t=0 corresponds to 9 AM.
(A) Use the four-step process to find P'(t).
(B) Find P(4) and P'(4).
(A) Use the four-step process to find P'(t).
P'(1)=