The time to fly between new York and Chicago is uniformly distributed with a minimum of 120 minute and a maximum of 150 minute. What is the standard deviation

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

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?