There's one important property which states that when a number is multiplied by its reciprocal, equals 1.
The commutative property of multiplication states that two or more numbers can be multiplied in any order, therefore, the expression: (7)×(13/29)×(1/7) can be changed to (7)×(1/7)×(13/29) and the result won't be altered.
Now, given that 7 and 1/7 are reciprocals, the result is 1. Therefore, the result of the multiplication equals (13/29)
Total cats: 8 Total expense: y Expense per lion:$8,000 Total lions: z Expense per leopard: $6,000 Total leopards: 8 - z Therefore, the equation becomes: total expense = number of lions × expense per lion + number of leopards ×expense per leopard y = 8000z + 6000(8 - z) y = 2000z + 48000