The shape with 9 sides is a Nonagon the prefix non means 9 and the word agon means shape so the word nonagon means 9 sides <span />
Its b= -0.2 or b= 1/-5 whichever one works best
Step-by-step explanation:
Since the box is a cube,
Length = Width = Height = 45m.
Volume of box = Volume of cube
= Length x Width x Height

The length is 7 and the width is 3