Which sample fairly represents the population? select two options.

using a yearbook to determine the most popular names for girls in the united states
asking the people exiting a vitamin store how often they exercise to determine the amount of time the average american exercises
calling every registered member of the national republican party to determine the voter turnout for a city’s mayoral race
sending a mandatory and confidential e-mail survey to every tenth employee of a company to determine overall job satisfaction
taking a poll in the main hallway between classes to determine the number of students who would be interested in a school trip to new york city

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- 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. 3- 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 part b?

Do,h = (7, 9) (14, 18) the scale factor is

Dawn is selling her mp3 player for 3 4 of the original price. the original price for the mp3 player was $40. how much is she selling her mp3 player for?