Which is a correct name for the angle shown?

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

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

If you are dealt 4 cards from a shuffled deck of 52? cards, find the probability that all 4 cards are diamondsdiamonds.