Which one of these pairs of numbers has GFC of 8? 8 and 28, 16 and 56, 32 and 16 and 40 and 56

Need on this geometry question. explain how you did it.

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

Brainliest ! which of the coordinates are not of th vertices of the feasible region for the system of inequalities y≤4,,x≤5,x+y> 6 a(2,4) b(0,6) c(5,4) d(5,1)