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What is the average rate of change of an object between falling 4 feet and falling 64 feet? *Please explain

What is the average rate of change of an object between falling 4 feet and falling 64 feet Please explain class=

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sbcardinals
Average rate of change can be calculated by the following

Δy/Δx

Our Δx refers to displacement.
Δx = 4 - 64 = -60

Our Δy refers to our Δf(x)

To get our f(x) values, we must plug in 64 and 4 into the function f(x)
f(64) = 8√64 = 64
f(4) = 8√4 = 16
Δf(x) = 16 - 64 = -48

So our rate of change is -60/-48 = 0.8

I believe the answer should be positive 0.8, but that's my best estimate.

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