e = 4 x 15 - 16 Let's create an expression. We have 4 bike racks e = 4 Each bike rack can hold 15 bikes e = 4 x 15 There are 16 bikes in the bike racks e = 4 x 15 - 16 So the value e will be the total number of empty spaces in the bike racks. The overall expression is e = 4 x 15 - 16