Data regarding salaries of several professional athletes shows in 1991 the salary was $255,000. In 2001 the salary was $1,440,00.

a) use data points to find linear function that fits the data

(1,255,000),(11,144000) are two points.

slope m =(144000-255000)/10=-11100.

S-255000=-11100(x-1).

S=-11100x+266100.

b) use function to predict average salary in 2005 and 2010. Let S represnt the average salary x years from 1990, let (x) represent the number of years since 1990. What is the average salary for 2005? What is the average salary for 2010

for 2005 x=15.

S=-11100*15+266100 =$99,600.

S(20)=-11100*20+266100=$44100.