Please help. And give an explanation. I am so lost.

2 opposite interior angle (opposite to the exterior angle) added together are equal to the exterior angle

6x-1+85 = 18x

6x +84 = 18x

subtract 6x from both sides

84 = 12x

divide both sides by 12

x = 7

hope this helps!

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

it should be a and d. lmk if i'm wrong xd