2.4.57 2 (x) = x - 2x, d f'(x). (B) Find the slopes of the lines tangent to the graph of f at x= -2, 0, and 2 (C) Graph f, and sketch in the tangent lines at x=-2, 0, and 2. (A) f'(x)= ---- -10 -5 Ay 10 5- -5- -10- 10 A The revenue (in dollars) from the sale of x car seats for infants is given by the following function. R(x)=56x-0.020x2 0x2800 (A) Find the average change in revenue if production is changed from 1,000 car seats to 1,050 car seats. (B) Use the four-step process to find R'(x). (C) Find the revenue and the instantaneous rate of change of revenue at a production level of 1,000 car seats, and interpret the results. (A) Find the average change in revenue if production is changed from 1,000 car seats to 1,050 car seats. (Round to one decimal place as needed.) The revenue (in dollars) from the sale of x car seats for infants is given by the following function. R(x)=56x-0.020x 0x2800 (A) Find the average change in revenue if production is changed from 1,000 car seats to 1,050 car seats. (B) Use the four-step process to find R'(x). (C) Find the revenue and the instantaneous rate of change of revenue at a production level of 1,000 car seats, and interpret the results. (A) Find the average change in revenue if production is changed from 1,000 car seats to 1,050 car seats. (Round to one decimal place as needed.) The total sales of a company (in millions of dollars) t months from now are given by the following formula. S(t) = 3t+1 (A) Use the four-step process to find S'(t). (B) Find S(15) and S'(15). (C) Use the results in part (B) to estimate the total sales after 16 months and 17 months. (A) S'(t) = ... The ozone level (in parts per billion) on a summer day in a certain metropolitan area is given by P(t) = 120 + 20t - 2t, 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'(t)=