A solar water heater costs about $5800 to install (after rebates). A traditional gas water heater costs about $900, and costs about $325 per year to run. The average annual cost to run the solar water heater is about $90.

1/Create a total cost function for the solar water heater. (Make sure to define your variables and use proper notation)

2/Create a total cost function for the gas water heater. (Make sure to define your variables and use proper notation)

3/Graph the functions you found on the same set of axes. (Make sure to label the axes, use an appropriate scale, and label all important points)

4/How many years would you need to use a solar water heater in order for the total cost to become less than the total cost of the gas water heater? How do you know?