B because negative divided by positive= negative and you have to divide -9 by 3 since the inverse operation of multiplication is dividing! It's like divide regularly, but with signs added...
Equation changes to 4x+(8 x .8)= 40. changes to 4x+6.4=40. subtract 6.4 from fourty, and you get 33.6. then you divide 33.6 by 4 and you get 8.4
x=4
The answer is 28 in square
They must make up their mind. Either they should never, or else they should always.