Answer:
2
Step-by-step explanation:
In △ABC, m∠A=15°, a=9, and b=10
We apply sine law




0.287576716 = sin(b)
b= 16.7129 degree
angle A= 15 degree, angle B = 16.71 degree
So angle C = 148.29


c= 
c= 18.28
Answer:
0.91
Step-by-step explanation:
The total of all numbers in the diagram is 35 +5 +10 +5 = 55.
The total of the numbers inside one or both circles is 35 +5 +10 = 50.
The probability of choosing a random student from inside one or both circles (plays some instrument) is 50 out of 55, or ...
50/55 ≈ 0.9090909... ≈ 0.91
P(A∪B) ≈ 0.91