I can't find any of these definitions, help me?

Question

-metric base unit

-metric prefix

-percent error

Answer 1

metric prefix

- A metric prefix is used with basic units such as gram, meter, and liter to indi-cate the magnitude of the measurement.

percent error

- formula used to find the inaccuracy of a measurement.

- With quantitative data, the absolute difference between the datum recorded and the known or accepted value.

- A measurement of how far off a value is from the accepted value.

can't find definition of metric base unit