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When you turn a fraction over you get a reciprocal.
The first derivative is the rate of change, and the second derivative is the rate of change of the rate of change.
The value of something
A unit rate has a denominator of 1 unit.or for an example.. 8 over 1 is a unit rate or 5 over 1 but you have to label what it is....
Birth rate : 12.47 over 1000 death rate : 6.74 over 1000