Which expression is equivalent to the expression given (12g2h7)(3g-2h-4)

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Can someone me out here number 4 plz

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)