From the question, the given table is
The table represents a linear function
Hence
To find the proportional equation for c in terms of s
The equation will be in the form

From the table
When s = 14, c = $12.74
When s = 16, c = $14.56
Hence the slope of the line is

Simplifying this gives

Consider the values
When s = 14, c= $12.74
Using a point slope formula

It follows
The equation for c in terms of s is

Simplifying the equation gives
