None of this because you can't answer 8+ 9 or with can't answer 56 <89
The volume of a rectangular prism can be given by the form

you know Volume, base, and height but you dont know width
so divide b and h to both sides

and you cna solve for width
now for 6.
dividing by a number is the same as multiplying by its reciprocal
4×17-x=84
68-x=84
-x=16
x=-16
X= -4; f(x)= -15
X= 2; f(x)= 3
X=5; f(x)= 12