different between variable intervals and fixed ratio
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It is ratio.
The rise and the run.
The answer depends on whether the ratio is in the context of the starting value, or time (over which the change takes place), or some other variable.
If the first derivative of a function is greater than 0 on an interval, then the function is increasing on that interval. If the first derivative of a function is less than 0 on an interval, then the function is decreasing on that interval. If the second derivative of a function is greater than 0 on an interval, then the function is concave up on that interval. If the second derivative of a function is less than 0 on an interval, then the function is concave down on that interval.
it is either one number verses another like 10 cookies and Joe to took 4 and Judy took 6 the ratio between Joe and Judy would be 4:6 but if it's what Joe took verses to total it would be 4:10