Pls. help my teacher gave me this and I have no idea how to do it.

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)