15.) A ticket to last years homecoming dance was $12.50. If the total revenue from ticket sales was $19,087.50, how many students attended the dance?

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?

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Worth 30 points! in this diagram, both polygons are regular. what is the value, in degrees, of the sum of the measures of angles abc and abd?