Maya is finding the area of the shaded triangle below.

if she considers 10 m to be the height of the triangle, what should she use as the triangle’s base?

a. 22 mb. 25 mc. 52 md. 73 m

The answer is 73 because it is the only number that is showing the measurement of the bottom of the triangle. Don't get confused with 22 they put the line of 10 after 22 to trick your brain up but reading the problem again they are asking for the WHOLE triangle. 
Hope this helps!