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Math Help - I keep getting it wrong! help!

  1. #1
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    Angry I keep getting it wrong! help!

    Estimate the area under the graph of f(x) = 2
    x
    from x = 0 to x = 4
    using four approximating rectangles and right endpoints. (Round your answers to four decimal places.)

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  2. #2
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    Re: I keep getting it wrong! help!

    We would be glad to help you, but we can't see where you are going wrong on this if you do not show your work.
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  3. #3
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    Re: I keep getting it wrong! help!

    Quote Originally Posted by brendasants View Post
    Estimate the area under the graph of f(x) = 2
    x
    from x = 0 to x = 4
    using four approximating rectangles and right endpoints. (Round your answers to four decimal places.)
    Is the function $f(x)=2\sqrt{x}$ or is it something else?
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  4. #4
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    Re: I keep getting it wrong! help!

    Quote Originally Posted by Plato View Post
    Is the function $f(x)=2\sqrt{x}$ or is it something else?
    yes that is the function.

    This is what I have done so far...
    a)
    split up f(x) into the intervals [0, 1], [1, 2], [2, 3], [3, 4], and used right endpoints, 1, 2, 3, 4 as the heights of the rectangles.
    A ≈ 1*2√1 + 1*2√2 + 1*2√3 + 1*2√4
    = 6 + 2√2 + 2√3
    ≈ 12.293


    b)
    A ≈ 1*2√0 + 1*2√1 + 1*2√2 + 1*2√3
    = 2 + 2√2 + 2√3
    ≈ 8.293

    My online hw keeps marking these answers wrong. What am I doing wrong?
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  5. #5
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    Re: I keep getting it wrong! help!

    The only thing I can think of is your assignment says FOUR decimal places, not three.
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  6. #6
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    Re: I keep getting it wrong! help!

    Quote Originally Posted by Deveno View Post
    The only thing I can think of is your assignment says FOUR decimal places, not three.
    wow I feel so dumb... that was the problem lol
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