Lets first convert everything to inches.
6 feet= 12*6 = 72 + 10 = 82 inches
8 feet= 12*8 = 96+9 =  105 inches
Now add!
82+105 = 187
Now convert them back to feet.
187/12 = 15 feet
12*15 = 180
187 - 180 = 7 inches
15 feet. 7 inches. 
Final answer: B. 15 ft. 7 in.
        
                    
             
        
        
        
1. The square root is about 1.73
2. The square root is about 1.41
 
        
                    
             
        
        
        
Answer:
The answer to the quesion is B.... 3/8in
Step-by-step explanation:
 
        
             
        
        
        
Width is 70 because 310-30=280
280/4=70