The term algebraic sum is used when the numbers you are adding include both positive an negative numbers. Ordinary sums are done with positive numbers only.
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The magnitude of the vector sum will only equal the magnitude of algebraic sum, when the vectors are pointing in the same direction.
It is: 15+w or w+15 as a algebraic expression
Write the following as an algebraic expression using x as the variable: The sum of a number and -8
It is: 15+5v
x+7=y