Answer:
 , all integers where n≥1
, all integers where n≥1
Step-by-step explanation:
we know that
The explicit equation for an arithmetic sequence is equal to
 
 
a_n is the th term
a_1 is the first term
d is the common difference
n is the number of terms
we have

Remember that
In an Arithmetic Sequence the difference between one term and the next is a constant, and this constant is called the common difference.
To find out the common difference subtract the first term from the second term

substitute the given values in the formula

The domain is all integers for 
 
        
             
        
        
        
Answer:
1)20 000 000×12cm
 240 000 000/100m
240 000 0/1000
2400km
31.6--1580×100×1000
31.6--1580 00 000
31.6/31.6--1580 00 000/31.6
1:5000000
 
        
             
        
        
        
Answer:
square, anddddddddddddddddd deskkkkkk I thinkjkkkkk
 
        
             
        
        
        
Hi there!  
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I believe your answer is:  

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Here’s why:  
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Hope this helps you. I apologize if it’s incorrect.