for every three bottles circle two, it would add up to 12 bottles, so it would be the one on the bottom right
The formula for area of a trapezoid is
so you add up the bottom base (17) and the top base (3) to get 20.
you then take the sum of the bases (20) times the height (8) to get 160.
lastly, you take 160 ÷ 2 to get your final answer, which is 80 (:
Do you mean checking your work? In that case it would be 9*20.