Final answer:
Jerry's cost per message is $0.05.
Step-by-step explanation:
The cost per message for Jerry's phone plan can be found by dividing the total cost she paid by the number of messages she sent.
Given that Jerry paid $0.75 for every 15 messages, the cost per message can be calculated as:
Cost per message = Total cost ÷ Number of messages = $0.75 ÷ 15 = $0.05
Therefore, Jerry's cost per message is $0.05.
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