Answer:
flip it around 9/13 reciprocal would be 13/9
 
        
             
        
        
        
Answer:
(-9,-1)
Step-by-step explanation:
You plug in the x and y values and solve the algebraic expression. 
 
        
             
        
        
        
Answer:
2800
Step-by-step explanation:
round 278 to 280
then round 11 to 10
then times the 2 answers together
 
        
                    
             
        
        
        
F(x)=-4x-1 if you sub 3 into it you get 3(-4)-1 which is -13 and 2x+4=10