hello my name is patricia

Question

sales of suv's in the US (in millions) for the years 1990-1999 can be modeled by the quadratic function f(x)=0.016x²+0.124x+0.787. sales in 1997 were approximately?

Answer 1

To begin this problem, we have to first recognize that the x represents the years, but not as years 1990, 1991, etc, but rather as years 0,1,2 etc, such that

0=1990

1=1991

2=1992

3=1993

4=1994

5=1995

6=1996

7=1997

8=1998

9=1999

 

So f(7) = 0.016 (7)² + 0.124 (7) + .787

f(7) = 2.439 million