what actually first derivatives tells us?

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answers:
Jeffrey K say: It tells you the slope of a line tangent to your function. This slope is different at each point.
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Como say: First derivative denotes rate of change.
For example if s (t) where s is distance and t is time
then ds / dt denotes rate of change of distance with respect to time.
ds / dt thus represents velocity, v

Similarly dv/ dt represents acceleration.
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htvpx say: fdjhjvuz
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zjrbj say: kxoitwqv
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xrpwu say: mcmckwso
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Steve A say: Instantaneous rate of change.
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