ANswer:
Explanation:
The area of a trapezoid is given by

where a and b are base lengths and h is the height of the trapezoid.
Now in our case,

and the area is 185 m^2; therefore, our formula gives

We just need to solve for AB.
Dividing both sides by 10 gives

multiplying both sides by 2 gives

subtracting 15 from both sides gives

which is our answer!