<u><em>Answer: r=12.3 *The answer must have a  positive sign or decimal point.*</em></u>
Explanation: 
First, you had to do is add 17.1 from both sides of an equation.

And then, simplify by equation.

You can also add by the numbers.


Hope this helps!
 
        
             
        
        
        
Answer:
13, 22, 25, 28
Step-by-step explanation:
Just fill in x values as values given in equation
 
        
                    
             
        
        
        
Answer:
3=20
4=15
5=12
Step-by-step explanation: