[tex]\huge\boxed{Hello!}[/tex]
To find the G.C.F. (Greatest Common Factor) of two numbers, we should list their factors:
28: 1, 2, [tex]\bold{4}[/tex], 7, 28
36: 1, 2, 3, [tex]\bold{4}[/tex], 6, 9, 12, 18, 36
The G.C.F. of 28 and 36 is 4.
[tex]\huge\boxed{\sf{Answer:4}}[/tex] ✔︎
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