A data set may have more than one, one, or no

Use the data on the dot plot to answer the question. how many people read for more than three hours last week? i'm on a unit test review

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?