Answer:
a=12
Step-by-step explanation:
I am assuming 20mm = breadth and 11mm = height
Ar of Triangle = 1/2 x b x h
= 1/2 x 20 x 11
= 110mm^2
I think its D <em>(or #4 - He Should use the mean because there are no outliers that affect the mean)</em> because the Median would be $175,000 but the Mean would be $638,400. It's honestly almost up to you.
