Pleaseee help if you can. :’)

Hi there!

Both bases have an angle measure of 55°, so the triangle is isosceles.

An isosceles triangle has a different base while the remaining two side-lengths are equal, therefore:

x + 18 = 3x

Subtract x from both sides:

18 = 2x

Divide both sides by 2:

9 = x

Therefore, x = 9.

should be 3.5

Step-by-step explanation: