SALES After discontinuing all advertising for a tool kit in 2004, the manufacturer noted that sales began to drop according to the model 500,000 S = 1+ 0.4ekt where S represents the number of units sold and t = 4 represents 2004. In 2008, the company sold 300,000 units. (a) Complete the model by solving for k. (b) Estimate sales in 2012.

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.