The answer is to the equation is b
Answer:
While factoring may not always be successful, the Quadratic Formula can always find the solution. The Quadratic Formula uses the "a", "b", and "c" from "ax2 + bx + c", where "a", "b", and "c" are just numbers; they are the "numerical coefficients" of the quadratic equation they've given you to solve.
source from: https://www.purplemath.com/modules/quadform.htm
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the answer is A. the commutative property of addition. this property states that no matter what order you put the numbers, the outcome will be the same.
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Answer:

MN means line joining point M to point N.