Question 379921: Below is a pattern made of cubes called "garages".
1 garage 2 garages 3 garages 4 garages 5 garages 6 garages
5 cubes 8 cubes 11 cubes 14 cubes 17 cubes 20 cubes
Write an expression for the number of cubes for any number of garages. Use n to stand for any number. Answer by robertb(4012) (Show Source):