Y= 2x2square + 4x -9 "a" value?

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

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?

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a