4. The table shows different ways that
   Beto can display his 12 model cars on
   shelves. How many shelves have 2 car
   if 8 of the shelves each have 1 car?

Beto has 12 model cars in total. If 8 shelves each contain 1 car, that uses up 8 cars, leaving him with 4 cars. To find out how many shelves can hold 2 cars, you simply divide the remaining cars (4) by the number of cars each of those shelves can hold (2). So, 4 divided by 2 equals 2 shelves. Therefore, Beto can have 2 shelves with 2 cars each.

In total, he has 8 shelves with 1 car and 2 shelves with 2 cars, making it a great way to showcase his collection!