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swiftskier96 Group Title

15. You live near a bridge that goes over a river. The underside of the bridge is an arch that can be modeled with the function y = –0.000471x² + .837x where x and y are measured in feet. How high above the river is the bridge (the top of the arch)? How long is the section of bridge above the arch? (1 point) The bridge is about 1,777.07 ft. above the river, and the length of the bridge above the arch is about 888.54 ft. The bridge is about 371.85 ft. above the river, and the length of the bridge above the arch is about 1,777.07 ft. The bridge is about 371.85 ft. above the

  • one year ago
  • one year ago

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  1. swiftskier96 Group Title
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    15. You live near a bridge that goes over a river. The underside of the bridge is an arch that can be modeled with the function y = –0.000471x² + .837x where x and y are measured in feet. How high above the river is the bridge (the top of the arch)? How long is the section of bridge above the arch? (1 point) The bridge is about 1,777.07 ft. above the river, and the length of the bridge above the arch is about 888.54 ft. The bridge is about 371.85 ft. above the river, and the length of the bridge above the arch is about 1,777.07 ft. The bridge is about 371.85 ft. above the river, and the length of the bridge above the arch is about 888.54 ft. The bridge is about 1,777.07 ft. above the river, and the length of the bridge above the arch is about 371.85 ft.

    • one year ago
  2. swiftskier96 Group Title
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    @Frostbite

    • one year ago
  3. Frostbite Group Title
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    2 sec

    • one year ago
  4. Frostbite Group Title
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    Swiftskier you can do differentiation right?

    • one year ago
  5. swiftskier96 Group Title
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    I remember learning it, but i dont remember how to do it.

    • one year ago
  6. Frostbite Group Title
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    Alright because if I understand the question right (maybe, maybe not) we can do the following: \[\frac{ dy }{ dx }=\left( -4.7*10^{-4} x ^{2}+0.837x\right)^{'}=0.837-9.42*10^{-4}x\] We check for horizontal tangent: \[\frac{ dy }{ dx }=0\] \[0.837-9.42*10^{-4}x=0\] \[x=888.535\] Then you can check for y your self, think it is right? or have I misunderstood the question?

    • one year ago
  7. Frostbite Group Title
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    ment -4.71 in the first equation sorry.

    • one year ago
  8. swiftskier96 Group Title
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    Well it shortens it because now i know its either A or C.

    • one year ago
  9. Frostbite Group Title
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    you check for A or C by insetting the x value inside the original equation

    • one year ago
  10. swiftskier96 Group Title
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    Ok ill try that.

    • one year ago
  11. Frostbite Group Title
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    I get the following result, but please make a check your self. \[-4.71*10^{-4}*888.535^{2}+0.837*888.535=371.852\]

    • one year ago
  12. Frostbite Group Title
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    and see if you agree

    • one year ago
  13. swiftskier96 Group Title
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    Yeah i got the same. So its C then. :) Thanks for all the help!!!!!

    • one year ago
  14. Frostbite Group Title
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    No problem :)

    • one year ago
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