You can line up 8 cards 64 different ways. 
8 * 8 = 64
        
                    
             
        
        
        
F x L = 3x10^10
L = 1x10^-11
F= 3x10^10 / 1x10^-11 = 3x10^21 unit
        
             
        
        
        
Answer:


Step-by-step explanation:


to use the elimination you have to make one of the numbers same 
so 

and you would have to change the sign so that both of the 3x could cancel out. 
New system of equation




so we know the y value so now you could find the x value take one equation 



you could try it with both of the equations 






 
        
             
        
        
        
step-by-step explanation: the increase = 204 - 120
increase = 84
percent increase = 84/120
percent increase = 70% so of course the percentage is 70%                          ( I hope this helps you )
 
        
             
        
        
        
Answer:

Step-by-step explanation:
From C-A, it goes from y=1 to y=5, so that 4 units
From A-B, it goes from x = -1 to x = 4, that is 5 units
Now, to find distance from B to C, we need to use the distance formula:

Where the variables are the respective points of B and C,
B (4,5) & C(-1,1)
So x_1 =4, y_1=5, x_2=-1, y_2=1
Plugging into the formula we get:

Summing it all (perimeter is sum of 3 sides):
Distance = 
3rd answer choice is right.