Velocity is a vector,
you can sum velocity in terms of direction components such as x and y.
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just find a common denominator and add the two numerators together then add the whole numbers
It requires you to add the numbers together.
The numbers you add together are called addends. If you add one number to another to form a sum, the number you add on can be called the augend. See the Penguin Dictionary of Mathematics.
If the shape is labeled on each side just add them together, but if it is not, measure the sides then add them together.
Measure all the sides of the shape and add their lengths together.