ummmm it could be third one i guesss
 
        
                    
             
        
        
        
Step by step explanation 
4n-8=5
4n= 5+8
4n=13
4/4 n = 13/4
n= 13/4
        
                    
             
        
        
        
9/10 : 1/10 = 45,000,000 : x
x = 45000000/9 = 5,000,000
Answer: 5 million acres
 
        
             
        
        
        
112 is the answer to your question
        
             
        
        
        
Answer:
136
Step-by-step explanation:
multiply 4 times 6, divide by two to get the area of the front side, then multiply that by two to get eh area of the two triangles. 
Then multiply each side, two sides of 5 time 7 and one side of 6 times 7