How many blocks do you need to add to Square 6 to get Square 7? to Square 9 to get Square 10? to Square 19 to get Square 20? Explain using powers. You need to add , or 2 −
2 blocks to Square 6 to get Square 7.

You need to add 19, or 2 −
2 blocks to Square 9 to get Square 10.

You need to add 39, or 2 −
2 blocks to Square 19 to get Square 20.