The sum of 8 and the absolute value of -13 what's the expression

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?

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?

Is ofat (-25, 0), (25, 0) co- (0, -15), (0, 15)?