What is the value of x in the figure?
A 42
B 48
C 132
D 138

D 138

Step-by-step explanation:

the outside angle(x) of a triangle whose base is extended is always equivalent  to the farthest 2 inside angles of the triangle.

x = 48 + 90 = 138

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step-by-step explanation:

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step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2