Automobile production. Using quadratic regression on a graphing calculator, show that th...

Automobile production. Using quadratic regression on a graphing calculator, show that the quadratic function that best fits the data on market share in Problem 54 is

(coefficients rounded to three significant digits).

Reference: Problem 54:

Automobile production. The table shows the retail market share of passenger cars from Ford Motor Company as a percentage of the U.S. market.

A mathematical model for this data is given by

where x = 0 corresponds to 1980.

(A) Complete the following table.

(B) Sketch the graph off and the market share data in the same coordinate system.

(C) Use values of the modeling function Ito estimate Ford's market share in 2010.1n 2015.

(D) Write a brief verbal description of Ford's market share from 1980 to 2005.