marcus wants to use a model to determine the difference − 8 − 3 ( + 3 ) -8-3+3. he starts with 8 negative counters. he wants to add 3 positive counters to the model without changing the value. how can he do that?

a. add 3 positive counters

b. add 3 positive counters and take away 3 negative counters

c. add 3 negative counters

d. add 3 positive counters and 3 negative counters

Graph a triangle (xyz) and reflect it over the line y=x to create triangle x’y’z’. describe the transformation using words. draw a line segment from point x to the reflecting line, and then draw a line segment from point x’ to the reflecting line. what do you notice about the two line segments you drew? do you think you would see the same characteristics if you drew the line segment connecting y with the reflecting line and then y’ with the reflecting line? how do you know?