10% if it started with 30 than it ends with 40 10% must have been added
        
             
        
        
        
Answer:
6÷2 1/3
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
7
Step-by-step explanation:
a=2
b=2
c=1
2ab cos C=a²+b²-c²=2²+2²-1²=4+4-1=7
 
        
                    
             
        
        
        
I think the answer is 231.84
        
                    
             
        
        
        
Say that you're thinking of number 
You multiply it by 8, and have 
You add -1 (i.e., you subtract 1) and have 
This equals -17, so you have

Add 1 to both sides

Divide both sides by 8:

So, you were thinking of -2.