The answer is 8 because you use the order of operations. So it would be 16 divided by 4, then you would do 4+4 which is 8
        
             
        
        
        
Subtract the 18 from the 78 then multiply both sides by -1, then divide by 5.
        
                    
             
        
        
        
Answer:
17) x=8
18)  or
 or 
Step-by-step explanation:
So the rule is  , "c" being the hypothenuse, or the long line that is opposite to the right angle.
, "c" being the hypothenuse, or the long line that is opposite to the right angle. 
17) We know that both values of x are equal to each other, which makes everything 10x easier!
                                                
(by the way we know the x values are our a and b values because they are legs! the way I like to remember the legs is that they are connected to the right angle box, and therefore support the hypothenuse)
<em>simplify</em> (╥︣﹏╥)     
                                                  
  
                                                    
 
                                                     
    
                                                    
   
                                                      
                                                         x=8      
18) Just pretend that the flipped triangle doesn't exist. It's parallel to the other triangle with values on it, and basically servers no purpose other than being parallel to the sister triangle :)
Anyways, since we know the hypothenuse (15) but we don't know one of our leg values (x), we're going to change our equation a bit!
                                                     
It doesn't matter if you put the one leg value in a or b, just as long as you stick to that same equation you started with the entire time!
                                                    
                                                     
   
                                                      
                                                
         The more you do these, the easier they'll get, so don't worry!
                             
 
        
             
        
        
        
Answer:
130
All of the angles on a triangle add up to 180 degrees.
 
        
             
        
        
        
Answer:
0 - 20
1 -22
5 - 30
10 - 40
15 - 50
20 - 60
Step-by-step explanation:
The initial amount this equation is 20 so that is why at 0 shirts its still 20 dollars for the set up fee and 2 dollars per shirt. Now that we have this information we can actually make a linear equation 
y = 2x + 20
y = the total cost
 x = the number of shirts
All you have to do next is plug in the number of shirts to get the total cost
Example:   2(1) + 20 = y
2 + 20 = y
22 = y
Meaning for 1 shirt it would be 22 dollars in total