n author released his book on May 1. His daily sales steadily increased until they peaked and then steadily declined. He found that his sales could be described by the absolute value function h(x) in which x represents the time since the release of his book (in days) and h(x) represents his weekly sales (in hundreds of books). What would be an appropriate domain for this function?
A. All the real numbers
B. All the positive integers
C. x ≥ 0
D. x ≤ 0

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As we are dealing with days, it makes no sense that x<0. Do you understand that?

And they must be integers. Otherwise you'd have 0.5 day, which in turn won't make sense either.

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