Can someone answer with steps and explanation? Thanks.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

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?