Question

WILL GIVE BRAINLIEST ANSWER AND EXPLAIN

EXPLAIN EXPLAIN EXPLAIN

Answer 1

So if you paid attention to the picture, you must have realized it is a 90° angle. So, now those two given measures equal 90, all you got to do make an equation that equals 90. 

4x+x=90                   
5x=90
x=18

Hope this helped you.....   :)

Answer 2

DevTools now has better support for CSS grid debugging!