ANSWERS: 2
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First convert feet to inches, 10 X 12 = 120. Then the insect travels at 9 - 2 = 7 inches per day. You can do the rest :-) ( simple division )
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There's a trick to this. You must write it out. 10 feet = 120 inches. on day 1 he has climbed 9 inches to 9 at night he slipped 2 = 7 on day 2 he has climbed 9 inches to 16 at night he slipped 2 = 14 the pattern continues ... 7 each cycle ... on day 16 he has climbed 9 inches to 114 at night he slipped 2 = 112 on day 17 he climbs EIGHT inches and reaches the top.
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