Mary and carl drove to the store to shop. their trip to the store and back home is graphed here. what was their average speed on the way home from the store?
a)
30 km/h

b)
40 km/h

c)
60 km/h

d)
cannot tell from this data.

d. all of the above

step-by-step explanation:

30,40,50 is correct answer

step-by-step explanation:

rectangles are made up of 4 right angles, which means that a side and a base meet perpendicular to one another.   their slopes then have to reflect perpendicular slopes.   perpendicular slopes are opposite reciprocals of one another.   for example, if the slope of one line is +2/3, then the perpendicular slope to that would be -3/2.   so we look for that combination in our choices.

all of them satisfy that condition (so what's the question, i guess? )