7. Suppose you have 60 pennies arranged into 12 stacks with 5 pennies in each stack. The 12 stacks are arranged into 3 rows with 4 stacks in each row as shown in Figure 4.24. For each of the following expressions, explain how to see the pennies grouped so that the expression describes the total number of pennies according to that grouping. Your explanation of the grouping should not involve rearranging the pennies. a. 3 X (4 X 5) b. (3 X 4) X 5 с. 5 X (3 X 4) d. 4 X (3 X 5) m- on 2, nd ng ain

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