Question a 15v battery delivers 90ma for 40 hours during, Ask an Expert

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Question: A 1.5V battery delivers 9.0ma for 40 hours. During that time, the battery voltage drops linearly from 1.5V to 1.0 V.

Part A: How much energy does the battery deliver during this time?

I need help to find how much energy the battery delivers during this time.

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