Answer:
30 square inch 
Step-by-step explanation:

 
        
             
        
        
        
Answer: The surface area of the triangular prism is 448 square millimeters.
To find the surface area, we just need to input our values into the formula that is given.
SA = 2B + Ph
SA = 2(84) + 56(5)
SA = 168 + 280
SA = 448
The final surface area is 448 mm^2.
        
                    
             
        
        
        
the answer to this question is -7.25 or 7 1/4