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vova2212 [387]
3 years ago
15

f x + y is rational, must x and y each be rational? A) Yes; because the sum of rationals is rational. B) No; because the sum of

irrationals is always irrational. C) No; because x and y could be additive inverses of each other. D) Yes; because x and y must be integers, and integers are rational.
Mathematics
1 answer:
Rudik [331]3 years ago
7 0
The answer is D) Yes; because x and y must be integers, and integers are rational.
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Answer: A

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The logic behind this is the diminishing marginal utility. The first unit of a good consumed gives the highest level of satisfaction, marginal utility reduces with additional units consumed.  In the same way, when we spend our income, we purchase the things that give us the maximum satisfaction first.

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