Is there any more information?
        
             
        
        
        
Answer:
11 music lessons. 
Step-by-step explanation:
We know that membership costs $165 and members pay $25 per music lesson. 
So, we can write the following expression: 

The 165 represents the one-time membership fee and the 25m represents the cost for m music lessons. 
We know that non-members pay no membership fee but their cost per lesson is $40. So: 

Represents the cost for non-members for m music lessons. 
We want to find how many music lessons would have to be taken for the cost to be the same for both members and non-members. So, we can set the expressions equal to each other: 

And solve for m. Let's subtract 25m from both sides: 

Now, divide both sides by 15: 

So, at the 11th music lesson, members and non-members will pay the same. 
Further Notes: 
This means that if a person would only like to take 10 or less lessons, the non-membership is best because there is no initial fee. 
However, if a person would like to take 12 or more lessons, than the membership is best because the membership has a lower cost per lesson than the non-membership. 
And we're done!
 
        
             
        
        
        
Answer:
4400? I think that's what u meant
 
        
             
        
        
        
Answer:
16.9°
Step-by-step explanation:
tan x = 1.7/5.6
tan^-1 x = 16.9°
 
        
             
        
        
        
139.50/55.8=t
t=2.5 yrs simple interest