Formulating an expression
I need help understanding how to write an expression and explain how I arrive at the answer for the following:
You are trying to decide how to most efficiently use your oven. You do not want the oven running at a high temperature when you are not baking, but you also do not want to waste a lot of time waiting for the oven to reach the desired baking temperature.
The instruction manual on the industrial oven suggests the oven temperature will increase by 35 degrees Fahrenheit per minute. When the oven is initially turned on, the temperature is 60 degrees Fahrenheit. What will the temperature of the oven be after 9 minutes?