Answer:
a = 5
Step-by-step explanation:
If it's easier for you, you can replace n(a) with y and put a as x.
Now the equation is y = 7x + 4.
It asks you to put in 39 as y.
39 = 7x + 4.
To solve this, the goal is to isolate the variable on one side. The first step I see is to subtract the 4 from both sides.
35 = 7x
Now divide both sides by 7 and we're done!
5 = x
 
        
                    
             
        
        
        
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Answer:
c
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer and Step-by-step explanation:
The computation is shown below;
As we know that 
The simple interest is 
Simple interest = Principal × rate × time 
For Account A, the principal would be 
2 = Principal × 3.2% × 3
So, the principal is $20.83
For account B, the principal would be 
38.50 = Principal × 2.2% × 30
So, the principal is $58.33
Now the interest for both the accounts are as follows
For account 1
= $20.83 × 3.2%
= $0.67
And, for the account 2
= $58.33 × 2.2%
= $1.28
As it can be seen that the account 2 has the highest interest 
The same is to be considered 
 
        
             
        
        
        
Answer: 5(x-1) 
Step-by-step explanation: