Question: Richard’s Heating and Cooling in Prescott, Arizona, charges $55 per hour plus a $30 service charge. Let x denote the number of hours required for a job and let y denote the total cost to the customer.

1. Find the equation that expresses y in terms of x.
2. Determine and .
3. Construct a table similar to Table 14.1 for the x-value 0.5, 1, and 2.25 hours.
   Table 14.1

   Time (hr) x	Cost ($) y
   5.0 7.5 15.0 20.0 22.5	125 175 325 425 475

4. Draw a graph of the equation that you determined in part (a) by plotting the points from part (c) and connecting them with a line.
5. Apply the graph from part (d) to estimate visually the cost of a job that takes 1.75 hours. Then calculate that cost exactly by using the equation from part (a).

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