Answer:
Those markings represent "absolute value"
It basically means to remove any negative sign in front of a number, and to think of all numbers as positive.
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
HAE~EBF~FCG~GDH by rule SAS
Answer:
multiply 8 x 4=22
Step-by-step explanation:
A and b are both accurate
For a:

which is true
For b:

which is also true