Answer:
Step-by-step explanation:
3x + x + 60 = 180.
first, we add the x's together.
4x + 60 = 180 
then we see if they all have a common multiple. in this case, they do. they are all divisible by 4, so we can use that.
x + 15 = 45
then, just subtract 15 from both sides, that way we get the variable by itself. 
x = 30
also, it is a right triangle. the top angle (3x) multiplied by 3 is 90. any triangle that has a 90 degree angle is automatically a right triangle. 
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
 
        
             
        
        
        
Answer:
x = 3
Step-by-step explanation:

Square both sides of the equation


(x - 3)(x - 5) = 0
x = 3 or 5
Now, you must always check your results because a result may not satisfy the original equation.
If x = 3, then  and 3 - x = 3 - 3 = 0
  and 3 - x = 3 - 3 = 0
So 3 satisfies the original.
If x = 5, then  ,  but 3 - x = 3 - 5 = -2.  Therefore, 5 does NOT satisfy the original equation.
,  but 3 - x = 3 - 5 = -2.  Therefore, 5 does NOT satisfy the original equation.
That means that x = 3 is the solution to the equation.
 
        
             
        
        
        
Answer:
answer is A
Step-by-step explanation: