math

Sarah had 4 pieces of rope.each piece was twice the length of the previous piece. the first piece was 1 foot 3 inches long. How many feet of rope did Sarah have altogether.

first piece=1 foot 3 inches
second piece= 2x1 foot 3 inches
third piece= 2 foot 6 inches x2
fourth piece=4 foot 12 inches
all the rope= 9 feet 24 inches

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asked by bandar
  1. better check again. The pieces are

    1'3"
    2"6"
    4'12"
    8'24"

    add them up. Or, using a geometric series, the total is 1.25(2^4-1) = 18.75

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    posted by Steve

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