The answer would be D- 146 degrees
Every triangle measures 180 degrees, if you add every expression and set it equal to 180 you will find the value of x.
Therefore, C is your answer.
Step-by-step explanation:
Y = 15
180 = 142 + 2y + 8
180 = 150 + 2y
30 = 2y
y = 15
x = 30.5
142 = 4x + 20
122 = 4x
x = 30.5
3r=10+5s
3(10)=10+5s
30=5s
-10
20=5s
4=s
the value of s is 4 when r equals 10