At 4 p.m., the temperature started to change drastically. Each hour, for three hours, the temperature decreased by 7 times degree F Which expression best shows another way to write the product for the temperature change?

The temperature decreased by 7°F each hour for 3 hours, so the total change is (−7) + (−7) + (−7), or −21°F. Choice D, −1 × (7 + 7 + 7), also equals −21. Choice C incorrectly includes four hourly decreases instead of three.

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