This is for a friend. all questions : )

What is (28 + 7 + 6 + 3) x 1/2 show your work

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?

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4