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A piece of construction paper has a thickness of 4.3 x 10-3 inches. A piece of cardstock has thickness of 5.2 x 10-3 inches. How tall is a stack of 15 sheets of construction paper and 20 sheets of cardstock? Write your answer in scientific notation.

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sqdancefan

Answer:

  1.685·10^-1 inches

Step-by-step explanation:

To find the total thickness, multiply the thickness of each sheet by the number of sheets and add the values for the different kinds of sheets:

  (15)(4.3·10^-3) +(20)(5.2·10^-3) = (64.5 +104.0)·10^-3 = 168.5·10^-3

  = 1.685·10^-1 . . . inches

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