He used the commutative property of addition.<span />
Answer:
A. point B (-11,7) Point C (11,-7)
Step-by-step explanation:
Answer:

Step-by-step explanation:
There's no need of hypotenuse for finding area of the triangle. To find the area of a triangle ,
Formula is =
Base of the triangle = 10 cm
Height of the traingle = 3 cm
Area of the triangle = 
Parallel lines<span> are coplanar </span>lines<span> that do not intersect</span>