Lines m and n are parallel, solve for the following values of x. Tell which theorem you used(name the angle pair)

x = 90  (Alternate exterior angles)

Step-by-step explanation:

Given that,

Lines m and n are parallel.

We need to find the value of x.

Here, (180-x) will be equal to x as the alternate exterior angles are equal. So,

(180-x) = x

180 = 2x

x = 90

So, the value of x is equal to 90°.

21.4 i did it already for s1

step-by-step explanation:

the answer will be the last one