Proving that EFGH is a square: points E,F,G,H separate the sides of the square ABCD into two lines. if AE=BF=CG=DH then AH=DG=EB=FC and it shows that if we connect the points E,F,G,H to each other with line we will have a square
First, you subtract the base fee of $3.50, which gives you $18.00. Then you subtract as many sevens there are in 18, which is two. And then your answer is shown, as two. Hope this helps!