So you subtract $22.89 from $54.73 to get a total of $31.84 and that’s how much the customer paid.
It's just telling you to multiple like 9×1=9 9×2=18 and so on.
draw a rectangle around it:
the widest part is from about -3 to 2 which is 5 units wide
height is from 3 to -4, which is 7 units
5*7 = 35
the top and bottom are angled so you can subtract a little for that
so I would estimate around 32 square units
Use the formula a^2+b^2=c^ which is 7.21
