A method or process of computation with figures. the elementary branch of mathematics
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it is a Greek word meaning the Science of Numbers or the Art of CountingThe word arithmetic is a noun. Its definition signifies it as the specific branch of math that deals with numbers only.
A high number and/or a G (Greek) on your arm meant you were chosen (meant to die).
The arithmetic average of seven consecutive odd number must be the fourth number which, by definition, is odd. If the average is not the arithmetic average, then the question is ambiguous. In either case the question has no valid answer.
The quadratic mean is a measure of the spread of values about their arithmetic mean. By definition, the arithmetic mean of the differences will be zero and so adds no information. Another measure is required and that is the quadratic mean.
Sure. There are other applications of arithmetic, but algebra without arithmetic is impossible. A broad knowledge of arithmetic is essential for mastery of algebra.