You are working on figuring out the number of rooms you will need to have open in your house. You know that there will be between 70 and 90 people attending and that each person needs 2 sq feet of space. Additionally, the food table will need 50 sq feet. Write an equation to figure out how much space you need? Include an input/output for values between 70 and 90, in increments of 5. Show work.