WILL GIVE BRAINLIEST PLZ HELP

x = 21°

Step-by-step explanation:

Consider the lines m and n. It's given that they're parallel to each other.

Now, the angles 123° and (5x+18)° can be considered as alternate interior angles, as they lie on opposite sides of the transversal. Thus, they will be equal.

Now all we have to do is solve the equality.

123 = 5x + 18

123-18 = 5x

5x = 105

or x = 21°

There you go, hope this helps!

Cube rooting a number that is the result of cubing a number means you will end up with the original number again.

for example, if you do 3 cubed you get 27, and the cube root of 27 is 3. This means Julio started with the number 20