With the concept of pattern we find that the answer for the sum of physical magnitudes is:
They must have the same units when expressed in base units.
To add two phsical quantities to meet some requirements:
* Must be of the same type
* Must be in the same base units
That they have the same type implies that we cannot add length with time or masses, length or speeds must be added with their pairs
The use of the same base unit guarantees that we use the same pattern, or that we must reduce the magnitudes to the same pattern, for example: we cannot add meters with inches directly, we must reduce inches to meters, which is the unit of the international system.
International System it guarantees the existence of common and reproducible patterns for all physical quantities.
Add two phsical quantities, the correct answer is:
must have the same units in base units
In conclusion, the measurement system and units allows adding magnitude of the same type with the same units of a base unit or standard.
learn more about measured here: https://brainly.com/question/20732638
