Question

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

Answer 1

Answer: $x=21$

Step-by-step 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:

$\frac{12x}{12}=\frac{252}{12}\\\\x=21$