Answer:
9
Step-by-step explanation:
2x=28-10
2x=18
x=18÷2
x=9
 
        
                    
             
        
        
        
Answer:
Isolate the variable by dividing each side by factors that don't contain the variable.
x= 40
 
        
                    
             
        
        
        
7 squared is 7 x 7 so the answer would be 49 I believe
        
             
        
        
        
Answer:
-1 and 1
Step-by-step explanation:
 
        
             
        
        
        
1/((R2+R1)/(R2*R1))
= 1/(R2+R1) * (R2*R1)/1
So answer 4