Afunction is created to represent the costs of living per person in the family. what restrictions would be made to the domain?

a.) the domain would only include integers.
b.) the domain would only include positive integers.
c.) the domain would only include positive numbers.
d.) the domain would include all real numbers.

Assemble the proof by dragging tiles to the statements and reasons column

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?