Lines a and b are parallel.
What is the value of x?

A. 5

B. 10

C. 35

D. 55

(A) 5

Step-by-step explanation:

Because of triangle sum, the vertical angle of the one whose label is 11x, is "90 - 7x," and because of Vertical Angle Theorem, 90 - 7x = 11x.

90 - 7x = 11x -->

90 = 18x -->

5 = x

answer is a

step-by-step explanation:

11.2

step-by-step explanation:

when doing tangent the tangent of the angle is equal to the opposite side from the angle over the adjacent side to the angle.

tan43 = x / 12

move 12 over by multiplying each side by 12

12tan43 = x

x = about 11.2