word problem for college algebra.

Question

Suppose that the sales of a particular brand of appliance satisfy the relationship S(x)=190x+1800 where S(x) represents the number of sales in year x with x=0 corresponding to 1990. For what years will sales be between 2370 and 3320?

Answer 1

The sales values can be substituted for S(x).

 

2370 = 190x + 1800

 

and

 

3320 = 190x + 1800

 

Solve both for x, and then remember that x is 0 in 1990, so if x was 5, the year would be 1995.