Answer:  h(-4)  
Step-by-step explanation:
If h(x) something is equal to 4  then set the equation equal 4  and solve for t. 
4t +20 = 4 
     -20    -20  
4t = -16 
t = -4  
So h(-4) = 4 
 
        
             
        
        
        
Answer:
12x the second -12x -16
Step-by-step explanation:
Solving systems of equations with 3 variables is very similar
 
        
             
        
        
        
Sixty eight and nine plus eleven equals 12