Let A = {w, x, y, z} and B = {a, b}. Use the set roster notation to write each of the following sets, and indicate the number of elements that are in each set. a. A x B
b. B x A
c. A x A
d. B x B

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

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?

Use multiples to write two fractions equivalent to 7/9. 14/18, 8/10 6/8, 21/27 10/12, 28/36 14/18, 21/27