Question

X=18 x=22.5 x=30 x=54

Answer 1

Since (x+90) and 4x are vertical angles, and vertical angles are congruent, you can set them equal to each other.

x+90=4x

90=3x

x=30

Answer 2

Answer:

The value of $x$ is 30°

Step-by-step explanation:

Observe that (x + 90)° and 4x° are verticle angles.

By definition, those angles are equal, taht is

$x+90=4x$

Then, we solve for $x$

$90=4x-x\\3x=90\\x=\frac{90}{3}\\ x=30\°$

Therefore, the value of $x$ is 30°. The third choice is correct.