Question

For 1990 through 2010, the sales S (in millions $) of shoes can be modeled by
S = (-0.98x^5)+(24.6x^4)-(210x^3)+(660x^2)-(320x)+1520
where x is the number of years since 1990. Were there any ears in which the sales were about $2 billion? Hint: Let S=2000 and get the equation = 0. then solve for the x intercepts. Window: x min = 0 for 1990, x max = 20 for 2010. During the years ______ and ______