A survey of 13 people at a bookstore showed that 5 had purchased a hardcover book. If 7 people are selected at random, what is the
probability that four of them had purchased a hardcover book?
Round to the nearest thousandth.

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?

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

These box plots show the number of electoral votes one by democratic and republican presidential candidates for the elections from 1984 through 2012. which statement best compares the spread of the data sets