Norman wants to buy a can of soda costing 75 cents from a vending machine. He has an unlimited supply of identical nickels and dimes. In how many orders can he insert coins into a machine to pay for his soda.
1 - 15 x 5c==75c 2 - 13 x 5c + 10c==75c 3 - 11 x 5c + 2 x 10c==75c 4 - 9 x 5c + 3 x 10c==75c 5 - 7 x 5c + 4 x 10c==75c 6 - 5 x 5c + 5 x 10c==75c 7 - 3 x 5c + 6 x 10c==75c 8 - 1 x 5c + 7 x 10c==75c
+89 
