Answer:
Step-by-step explanation:
Area is half base × height 
If area = 140 and height = 20 inches
base =140 ÷ 20 = 7 × 2 = 14 inches
 
        
             
        
        
        
One and a half gallons. (1.5 gallons)
 
        
             
        
        
        
Answer:
75.36
Step-by-step explanation:
3.14(pi) x 24(diameter) = 75.36(circumference)
 
        
             
        
        
        
Bill should put the brackets around 18-9 so the correct answer is option B. 10- 4 +3 x (18-9)
        
                    
             
        
        
        
The volume of a rectangular prism is:
V=xyz where x,y,z are the dimensions...
In this case:
V=5*(2 1/2)*(1 1/2)
which is equal to 
V=(12 1/2)*(1 1/2)
So the top one and the third one down are the correct volume.