Answer:
0
Step-by-step explanation:
Thinking process:

=
by Stoke's Theorem
=
since z = 
Answer:
It's a ray because it has a point and one line that goes on in a direction.
Step-by-step explanation:
The answer is 75° because all three angles of a triangle must add to 180°
Answer:
zero probability, which means impossible
Step-by-step explanation:
there are no yellow marbles to select from