x^2 +7x +10
when factored becomes
(x+2) (x+5)
the zeros are x +2 = 0, x = -2
x +5 = 0 x = -5
zeros are -2 and -5
The sum of all 3 angles is 180 degrees, you should be able to solve from here.
I am not sure about the probability but I cant tell you these events are independent because u don't need to roll a five for a coin to land on heads
