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Answer: 20n + 5
Step-by-step explanation:
From the question, we are told that jackets cost $15 and a set of decorative buttons cost $5 and that the delivery fee is $5 per order.
The expression 15n+5n+5 gives the cost, of buying jackets with buttons for n people. The expression after combining like terms would be:
= 15n + 5n + 5
= 20n + 5