The equation is a scientific law, Newton's Law of Gravity,

This is a pretty bad question. Newton's Law of Gravity is a mathematical model of gravitation, originally a theory, verified by observation, and now superseded by the General Theory of Relativity.
C is probably the best answer to this poor question.
 
        
             
        
        
        
Answer:
49
Step-by-step explanation:
4^3=64
5(-3)=-15 
64+(-15)=49
 
        
                    
             
        
        
        
The square root of 46 is 6 because 6 x 6 is 46
        
             
        
        
        
Answer:
x = 7
Step-by-step explanation:
First, move the variables and numbers to the opposite sides
-3x = 12 - 33
Then add and subtract
-3x = -21
Divide and multiply 
-x = -7
x = 7