The scatterplot contains data points, showing the number of hours a coffee shop is open (x) and the number of customers served (y). A graph with time open (hours) on the x-axis and customers on the y-axis. Line c is the line of best fit.

Using the least-squares regression method, which is the line of best fit?

line a
line b
line c
line d

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?