Answer:
4 units
Step-by-step explanation:
Ⓗⓘ ⓣⓗⓔⓡⓔ
Well, it would have to be 4 because 2+4=6>5
5+4=9>2
5+2=7>4
(っ◔◡◔)っ ♥ Hope this helped! Have a great day! :) ♥
BTW, brainliest would be greatly appreciated, I only need one more before I advance, thanks!