If A= and B=, find BA

What is (28 + 7 + 6 + 3) x 1/2 show your work

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

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?