Answer:
D
Step-by-step explanation:
The other ones don't make sense. The answer is 3.5x+x=9.90
 
        
             
        
        
        
Answer:
 5 = 9 + 6
Step-by-step explanation:
 
        
             
        
        
        
6.3 x 10'-8
63 - 8
55
55 is the answer
        
             
        
        
        
The answer is five because if you go for -3 that’s one in 8-6 is two and if you add one and three that’s for sure the only one you need is five and that would be just make no sense at all
        
             
        
        
        
I think this is the answer 
A)Cathy had $6 at first 
B)Selena has $24 at first