Now use the graphing calculator to find the area of a circle, given it has a circumference of 25 in. Enter the equations below into the calculator:

A model house that runs completely on renewable energy uses 2windmills and 3 solar panels. Each windmill generates M kilowatt-hours (kWh) of energy per year, ad each solar panel generates S kWh per year. Which expressions can we use to describe how many kWh of energy the model house will output in 10years?