Answer:
Step-by-step explanation:
We can use to formula of finding the area of a trapezoid in this problem.
<em>Formula: </em>[(<em>b</em>1 + <em>b</em>2)/2] *<em>h,</em> where <em>b</em>1 and <em>b</em>2 are the bases and <em>h</em> is the height.
<em>b</em>1 can be the bottom base, which has a length of 21 units.
<em>b</em>2 can be the top base, which has a length of (21-9-3)+3 = 12 units.
<em>h</em> has a length of 8, since it is the height.
Plugging these into the formula, we can see that the area of the entire figure is (21+12)/2 * 8 = 33/2 * 8 = 33*4 = <u>132</u><em> </em>units².
Hope this helps! :)