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prealgebra senior

Problem

A bug crawls along a number line, starting at . It crawls to , then turns around and crawls to . How many units does the bug crawl altogether?
(A)
(B)
(C)
(D)
(E)
Solution
Crawling from to takes it a distance of units. Crawling from to takes it a distance of units. Add and to get
Final answer
E