To find the area of a trapezoid, it’s 1/2(base 1 + base 2) x height.
so in this case, base 1 is 16 (add 12+2+2) (the top one) and base 2 is 12 (the bottom one) and the height is 9. 
you input all the values in the formula and you get 126in. 
hope this helped:)
        
             
        
        
        
Answer:
-3/5
Step-by-step exp:
given in the file. Hope it helps.
 
        
             
        
        
        
Move the decimal to right 3 times
        
                    
             
        
        
        
Well actually that is in the value place of the tenths not tens.
        
             
        
        
        
The gas would have cost $19.50. Hope this helps :)