Just find the volume of a triangular prism. 
volume=1/2*length*width*height.
        
             
        
        
        
Ok this inequality tells you the number of devices you can have before the new plan costs more than the old plan. The new plan expression is $4.50x + $94m =  y ( total cost). The old plan is $175m = y (total cost). You can see m (number of months) in both equations, you don't need it this time since we're going to to compare both to one month. Since they're both equal to y you can make them equal to each other. $4.50x + $94 = $175. Now you want to figure when the new plan is less than the old plan you switch the equal sign for a less than sign. $4.50x + $94 < $175; this will help you find the inequality you want. From there just use algebraic steps to find that x has to less than 18 or 
x < 18. 
 
        
             
        
        
        
Answer:
Height of this cone is  26.5'6'3 meters -.071
Step-by-step explanation:
 Mark me brainlist hope it helps
 
        
             
        
        
        
30 x 28= 840 
It's would beat 840 times in half an hour.