Answer:

Step-by-step explanation:
The nth term of an arithmetic sequence is given by the formula,

We were given that the 9th term is  .
. 





The sum of the first n-terms is given by the formula,

To find  , we substitute
, we substitute  ,
,  and
 and  .
.





The correct answer is D
 
        
                    
             
        
        
        
Answer:
the correct answer would be 6 inches.
Step-by-step explanation:
12*.5=6
 
        
             
        
        
        
Answer:
7 years (This answer is to the nearest year) 
Step-by-step explanation:
The way you could work this out is by trial and error. 11 % a year means that its population increases by 4400 annually. 40,000 X 1.11^1 gives you the amount it would be after one year (44000). I got the 1.11 because of the percentage (0.11) plus the amount you need to do percentage increase (1). Then all you do is keep on going up till you hit the number you need (80,000) after about 7 years the total would have hit 80,000 and would have actually went past it (83046)
 
        
             
        
        
        
Answer:
t=$2.20c
Step-by-step explanation:
4 pieces of chicken for $8.80
Cost of 4 pieces of chicken=$8.80
$8.80/4=$2.20 for each chicken
t=$2.20c
 
        
                    
             
        
        
        
9514 1404 393
Answer:
   x = 7
Step-by-step explanation:
We can write a proportion relating the short segment to the full length:
   (x+1)/18 = 4/(4+5)
   x +1 = 8 . . . . . . multiply by 18 and simplify
   x = 7 . . . . . . . .  subtract 1