Actually the answers A since t is for text messages and it costs .15 and m is minutes and costs .07 so we add those two together to he .15t+ .07m then there's a discount of 2.50 so we subtract. So our final equation is .15t + .07m - 2.50 = C
        
             
        
        
        
The triangle to solve for has a leg or 12 feet, hypotenuse of 20 feet, so solve for Pythagoras 

  for a

a = 16 feet
 
        
        
        
-3 is one of them hope this helps
        
             
        
        
        
The answer is 30°.
Rule: All three sides must add up to 180°. 
Since A=60 and the side vertical to the angle which is 90° then side C would be C=90° and that adds up to 150°, so you can conclude that angle B is 30°.
I hope I helped!
        
                    
             
        
        
        
Answer:
Sorry if I got it wrong.
Step-by-step explanation:
You add them together then devide by 3 so 333.333333333 squar feet per gallon so the art room is 400 so I would say about 1.5 or close to that