11 is 50% of 22 11 is the portion 50% is the rate 22 is the base The rate is a percent or fraction, the base is the whole unit, and the portion is a part of the base
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a car braking is a negative rate of velocity change
it is a denominator of 1 unit
A reciprocal rate is the inverse of a rate. For example, if one were to say "I can drink 5 drinks in 1 hour," then the reciprocal rate would be "In one hour, I can drink 5 drinks."
a car going from stoplight to next intersection accelerates at a positive rate of velocity change
The population of a species over a period of time will change according to some rate of change.