Question

If you could make sure that the following problems are done right, it would be great. Evaluate expressions by using the order of operations (PEMDAS).

1. xm - 2m if x= -2 and m= -3
(-2) (-3) - 2 (-3)
> (-2)(-3)= 6
> 2(-3)= -6
>6 minus negative 6 means 6 plus 6, so the ans. is 12

2. 2abc - 3ab if a= 2, b= -3, c=4
2(2)(-3)(4) - 3(2)(-3)
>2(2)=4(-3)= -12(4)= -48
>3(2)=6(-3)= -18
>-48 minus -18 means -48 plus 18, so the ans. is -30

3. -x(y+z) if x=4, y= -3, z= -5
-(4)((-3)+(-5))
>((-3)+(-5))= -8
> -(4) means -1(4), which equals -4
> -8 times -4 equals 32 (ans.)