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anonymous

  • one year ago

Water coming out from a fountain is modeled by the function f(x) = −x2 + 5x + 4 where f(x) represents the height, in feet, of the water from the fountain at different times x, in seconds. What does the average rate of change of f(x) from x = 3 to x = 5 represent?

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  1. anonymous
    • one year ago
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    The water falls down with an average speed of 3 feet per second from 3 seconds to 5 seconds. The water falls down with an average speed of 5 feet per second from 3 seconds to 5 seconds. The water travels an average distance of 3 feet from 3 seconds to 5 seconds. The water travels an average distance of 5 feet from 3 seconds to 5 seconds.

  2. anonymous
    • one year ago
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    @campbell_st plzz

  3. anonymous
    • one year ago
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    @welshfella anything

  4. anonymous
    • one year ago
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    please bro

  5. welshfella
    • one year ago
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    plug in x = 3 and x = 5 into the equation to see the height of the water at these times f)3) = -(3)^2 + 5(3) + 4 = -9+15+4 = 10 feet can you work out the height for x = 5?

  6. welshfella
    • one year ago
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    just plug in x=5 and work it out as above

  7. anonymous
    • one year ago
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    im confused

  8. anonymous
    • one year ago
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    what exactly do i have to solve

  9. welshfella
    • one year ago
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    do as I have done but replace the 3 by 5 f(5) = -(5)^2 etc

  10. anonymous
    • one year ago
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    ughh

  11. welshfella
    • one year ago
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    |dw:1437683865329:dw|

  12. anonymous
    • one year ago
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    so its 5

  13. anonymous
    • one year ago
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    @welshfella

  14. welshfella
    • one year ago
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    No 5 replaces x in the formula then you work it out

  15. anonymous
    • one year ago
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    5x-21

  16. anonymous
    • one year ago
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    @welshfella

  17. welshfella
    • one year ago
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    -(5)^2 + 5(5) + 4 = ?

  18. welshfella
    • one year ago
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    you REPLACE the x in x^2 + 5x + 4 by 5

  19. anonymous
    • one year ago
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    4

  20. welshfella
    • one year ago
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    right

  21. anonymous
    • one year ago
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    so now what

  22. welshfella
    • one year ago
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    so the height of the water goes from 10 to 4 feet in 5-3 = 2 seconds it decreases 6 feet in 2 seconds so which choice is correct?

  23. anonymous
    • one year ago
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    B?

  24. welshfella
    • one year ago
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    average speed will be 6/2 = 3 feet per second

  25. welshfella
    • one year ago
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    no

  26. welshfella
    • one year ago
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    its falling and average speed is 3

  27. anonymous
    • one year ago
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    So a

  28. anonymous
    • one year ago
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    @welshfella

  29. welshfella
    • one year ago
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    yea its got to be A

  30. anonymous
    • one year ago
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    THX

  31. welshfella
    • one year ago
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    yw

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