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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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?

Mathematics
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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.
@welshfella anything

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Other answers:

please bro
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?
just plug in x=5 and work it out as above
im confused
what exactly do i have to solve
do as I have done but replace the 3 by 5 f(5) = -(5)^2 etc
ughh
|dw:1437683865329:dw|
so its 5
No 5 replaces x in the formula then you work it out
5x-21
-(5)^2 + 5(5) + 4 = ?
you REPLACE the x in x^2 + 5x + 4 by 5
4
right
so now what
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?
B?
average speed will be 6/2 = 3 feet per second
no
its falling and average speed is 3
So a
yea its got to be A
THX
yw

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