I dont have time to do all of these right now my apolgies but Ill explain how to do it. 
The 3 angles of a triangle add up to 180.
So let me show you how to do 1.
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1. 58 degrees
 92, 30, ?
If we add together the first two angles,
92+30= 122
Knowing the total addition of all three angles would ne 180, we can subtract 122 from it to get the third angle.
180-122= 58
So we now know the last angle is 58 degrees because
92+30+58=180
        
                    
             
        
        
        
The first step was the combine the like terms; in this example he is subtracting the 3x on both sides of the =. 
If you were to solve the equation it would look like this:
2x+6=3x-8
-3x -3x
-x+6=-8
 -6 -6
-x=-14
/-1 /-1
x=14
        
             
        
        
        
Step-by-step explanation:
hey.....
how are uh
 
        
             
        
        
        
Answer:
A^(2) + B^(2) = C^(2)?????????????
Step-by-step explanation:
that's an isosceles triangle, not a right-angle triangle
 
        
             
        
        
        
Answer:
(3/2, -1/2)
Step-by-step explanation:
add the 2 inequalities together.
you get 2X<3 so x<3/2. plug X back in and solve for y and you get y= -1/2