Answer:
Hello. y=1/2x-2
Step-by-step explanation:
The line that is perpendicular to this line ،its slope must be 1/2
So:

Answer: Triangle
Step-by-step explanation: If you cut it vertically, the base is changed into a triangle.
Hope this helps!
I think Theodosius the best measure. The outliers will not effect the measure. If you use mean, you add all the data points and divide by the number of data points. The extremes will skew the data. If you use mode, that may work also. You find the data that occurs most often.