Answer:
17. Tallest post is 3 feet tall. Each of the next tallest post is 5/6 the last.
a. Height of the shortest post: 3 x 5/6 x 5/6 x 5/6 x 5/6
b. 625/432 feet to be exact.
18. a. Nicole ran: 4 : 2 : 2 : 2
b. Half a mile
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