algebra
posted by lieyn .
The projected annual sales (in dollars) of a new product are given by the equation S=150,000+3000t, where t is the time in years from 2005. Such an equation is called a trend equation. Find the projected annual sales for 2010. Is S a function of t?

since S is a polynomial, it is a function.
2010 is 5 years from 2005, so t=5
A = 150000 + 3000*5 = 150000+15000 = 165000