Answer: The answer would be C. Please give me a thanks :) bye!
Step-by-step explanation:
 
        
                    
             
        
        
        
A triangular prisms' formula is: lwh = Length * Width * Height
substitute the variables
L = 21in
W = 15in
H = 17in
21*15*17
= 5,355in
The volume of the figure is: 5,355in^3
        
             
        
        
        
The angle on one side of a straight line is 180°, so 40° + 60° + h = 180°. 
If you rearrange this you will get h = 180° - 60° - 40°, this will give you: h = 80°. 
Hope this helps
        
             
        
        
        
Answer:
cant be factored
Step-by-step explanation: