Answer:
4+7x
Step-by-step explanation:
 
        
             
        
        
        
I'm pretty sure this is the answer:
(10)sin(40°) = AC
It's <em>sin </em>becasue it <em>needs </em>the opposite side of 40° and <em>has </em>the hypotenuse. 
        
             
        
        
        
Answer:
AB is parallel to BE because it is an equilateral triangle. 
BE is parallel to EC because it has 2 of the same angles to the same sides are equal.
Hope that helps, it's a tad hard to explain
 
        
             
        
        
        
Answer:
9x over 2 plus 60 if that's an option
 
        
             
        
        
        
Remember the formula for calculating volume is: Volume = Area by height. V = A X h.
For a triangle the area is calculated using the formula: Area = half of base by altitude. A = 0.5 X b X a.
So to calculate the volume of a triangular prism, the formula is: V = 0.5 X b X a X h