Write an addition that corresponds to each of the following sentences and then answer the question:
a. A certain stock dropped 17 points and the following day gained 10 points. What was the net change in the stock’s worth? –17 + 10 = –7 giving a net change of –7 points
b. The temperature was –10˚C and then it rose by 8˚C. What is the new temperature?
c. The plane was at 5000 ft and dropped 100 ft. What is the new altitude of the plane?
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