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how fast something can change
The value of something
An answer
Unit rate is usually "how fast the rate of something changes, per one unit of time".
The rate of something is usually a measurement in change of something 'over' something else. Here the word 'over' means 'divided by'. For example your velocity is a rate. When you are driving, your car covers a certain distance 'over' a certain span of time. Thus the rate here we call velocity. Distance/Time = Avg VelocityThe value of the letter Z in the equation 8 Z times 64 is 8. This is a math problem.