I would go with option A for this
        
             
        
        
        
Answer: Slope is the measure of the steepness of a line. It can be calculated with the equation rise/run or change in y/change in x. 
Step-by-step explanation:
 
        
             
        
        
        
If you mean by x over 4 that it is fraction then there is no different between it and divisions
x/4 = -120
x = -120 × 4 ( when division goes to the other side of equal it turns into multiplication)
x = -480
A. -480
        
                    
             
        
        
        
36
Step-by-step explanation:
 5x is 15
x is 3
12 times 3 is 36
 
        
                    
             
        
        
        
Answer:
97,175
Step-by-step explanation:
I don't think It's necessary, but I am gonna do it anyways. 
15*6=90 
15*7=105
105 - 90 =15
15/2 =7,5
90+7,5= 97,5
15*6,5=  97,5
0,05*6,5= 0,325
97,5 - 0,325 =   97,175