Write an expression to describe the situation.
Suppose the temperature outside is dropping 3 degrees each hour. How much will the temperature change in 8 hours?
8 (-3)
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10
What is a sum?
The answer to an addition problem.
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20
Write an expression to describe the situation.
A deep-sea diver descends below the surface of the water at a rate of 60 feet each minute. What is the depth of the diver after 10 minutes?