Tracking Weight A person weighs himself every Monday for four weeks. He gains one pound the first week, loses three pounds the second week, gains two pounds the third week, and loses one pound the last week.
(a) Using positive numbers to represent weight gains and negative numbers to represent weight losses, write a sum that gives the total gain or loss over this four-week period.
(b) If he weighed 170 pounds at the beginning of this process, what was his weight at the end?
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