Hi there!  
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I believe your answer is:  
31.69
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Here’s why:  
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- '9' is in the hundredths place. The rounding is the digit to it's right, or '3'.
- Since 3 is less than or equal to 4, we would round down.
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31.693 ≈ 31.69
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Hope this helps you. I apologize if it’s incorrect.  
 
        
             
        
        
        
The best thing is to have a ruler with the appropriate units to construct these triangles;)
 
        
        
        
All numbers that are 0._ are _/10 therefore that would be 9/10 because this ratio cannot be simplified further.
        
             
        
        
        
It should be 3,000
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A= P(1 + r/n) ^nt
21000=7000(1+0.055/2)^1t
t = 20.52 years