Hi there! 
To find the perpendicular slope you need to flip the fraction and change the sign. So 1/2=2/1 and tge original slope was positive, so the slope is -2. Now you sub in the point (-7,-4) in for x and y in the formula y=mx+b and solve for b (sub in 2 for m as well) 
Y=mx+b
-4=-2*-7+b
-4=14+b
-4-14=b
B=-18
The equation is y=-2x-18
Hope this helps!
        
             
        
        
        
Answer:
its 48.139
Step-by-step explanation:
i also needed help , but i only saw this so i guessed the answer and it is 48.139.
 
        
             
        
        
        
Answer:  The answer is (C) 180° rotation.
Step-by-step explanation:  Given that the point A maps to the point A' by a rotation. We are to select the statement that describes the rotation.
In the given figure, the co-ordinates of point A are (-3, 5) and after rotation, the co-ordinates of point A' are (3, -5).
Therefore, the point (x, y) changes to (-x, -y) after rotation. This is the result of 180° rotation.
Therefore, the point A is rotated through an angle of 180° to reach at the point A'.
Thus, the correct option is (C) 180° rotation.
 
        
                    
             
        
        
        
Idk b, im stuck on the same thing
        
             
        
        
        
So 4X6=24 so i think the answer is 24