6.8 x 10^13 = 68,000,000,000,000
9.46 x10 ^12 = 9,460,000,000,000
6.8 x 10^13  *  1 light year / 9.46 x 10^12 = 7.188 light years.
        
             
        
        
        
1) The variables are "k"
2) There are 4 terms
3) The coefficients are k
4) The constants are -7, 3, 10, -5
5) The like terms is -7k, 3k, 10k, -5k
The answers are pretty direct but, hope this answers your question. 
Have a great day/night! 
 
        
                    
             
        
        
        
Answer:
2.27700622339
Step-by-step explanation:
Calculated your welcome
 
        
                    
             
        
        
        
When you simplify the expression 1/1+cot^2x the final product is C. sin^2 (x).
Hope this helps!