"Average" as in arithmetic mean is equal to (a1 + a2 + a3 + ... + an)/n, where ai are elements of a set.
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product and reaction are equality favored in the reaction
Lateral means side, quadrilateral (4 sides)
I don't know about "mathematically" but the idiom is what you say when you don't want any change back from the money you paid for your items with -- it's leaving them a "tip" of the extra money.
The Median is a form of average. Mathematically, the average is the sum of all values, divided by the number of values there are. This is known as the arithmetic mean. An Average is meant to give a representative value of all of your values. If you have a lot of numbers that are very similar and then one that is massively out of proportion with all the others, then the mean doesn't give a representative value. There are also two other forms of average, other than the arithmetic mean. They are the Mode and Median. The Mode is the most common value in a list and the Median is the middle value when all are arranged in numerical order. Sometimes it is better to use them.
if an equation is given the correct answer, it is mathematically correct.