Question

Find the value of x because this is really hard for me and I don't get it.

Answer 1

Answer:
`x=21`

Explanation:

For this exercise it is important to remember that, by definition, the sum of the Exterior angles of a polygon is 360 degrees.

Knowing this, you can write the following equation:

`(4x-1)+3x+(5x+4)+105=360`

Now, you must solve for "x" in order to find its value. The steps are:

- Add the like terms:

`12x+108=360`

- Subtract 108 from both sides of the equation:

`12x+108-108=360-108\\\\12x=252`

- Divide both sides by 12:

`(12x)/(12)=(252)/(12)\\\\x=21`