Question

What is the value of x?

Answer 1

Answer:

x = 5

Step-by-step explanation:

The square mark on one of the angle states that the angle is a right angle, meaning that it is 90°.

If you only include the three angles, 8x - 5, 90°, and 55°, then they are supplementary angles.

Supplementary angles are angles that should add up to 180°.

So the equation is:

8x - 5 + 90 + 55 = 180

Now solve:

8x - 5 + 145 = 180

8x + 140 = 180

8x = 180 - 140

8x = 40

x = 40 ÷ 8

x = 5