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13 November, 16:00

Joe is finding the length of a rectangular prism. The volume of the prism is 204 ft3. The width is 3.5 ft, and the height is 5 ft. His work is shown below.

V = l w h. 204 = 3.5 (5) l. 204 = 8.5 l. StartFraction 204 Over 8.5 EndFraction = StartFraction 8.5 Over 8.5 EndFraction l. 24 = l.

What error did Joe make?

He incorrectly substituted into the volume formula.

He added 3.5 and 5 when he should have multiplied them.

He incorrectly divided 204 by 8.5.

He did not make a mistake in finding the length of the prism.

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Answers (2)
  1. 13 November, 16:37
    0
    B. He added 3.5 and 5 when he should have multiplied them.

    Step-by-step explanation:

    Let's observe Joe's steps:

    - V = lwh

    - 204 = 3.5 * (5) * l

    Here, * means to multiply, so we're supposed to multiply 3.5 to 5, which would give you the answer 17.5. Unfortunately, look what Joe got: he obtained the value of 8.5, and if we observe, 3.5 + 5 = 8.5.

    That's how we know that Joe added instead of multiplied, as he should have done. Thus, the answer is B.
  2. 13 November, 18:08
    0
    He added 3.5 and 5 when he should have multiplied them.

    Step-by-step explanation:

    Volume = length * width * height

    204 = 3.5 * 5 * length

    204 = 17.5 * lenth

    length = 204/17.5

    length = 11.65714286
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Home » Mathematics » Joe is finding the length of a rectangular prism. The volume of the prism is 204 ft3. The width is 3.5 ft, and the height is 5 ft. His work is shown below. V = l w h. 204 = 3.5 (5) l. 204 = 8.5 l. StartFraction 204 Over 8.
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