You buy 80 of your favorite songs from a Web site that charges $0.99 for each song What is the cost of 80 songs?

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

Which of the following is true for the relation f(x)=2x^2+1

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?