Answer:
3(y+6)=30
3y + 18 = 30
18 - 30 = 3y
12 = 3y
12/3 = y
4 = y
or
y = 4
Step-by-step explanation:
Convert everything to terms of sine and cosine:
The factors of cancel to give
obtuse
the triangle is larger than a 90 degree angle