9514 1404 393
Answer:
   11) x = 9
   12) x = 9
Step-by-step explanation:
11) Corresponding segments are proportional, so ...
   x/6 = 12/8
   x = 6(12)/8 . . . multiply by 6
   x = 9
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12) Similar triangle relationships show you the geometric mean relationship that applies in this case.
   long side/short side = x/3 = 27/x
   x² = 3·27 . . . . . . cross multiply
   x = √(3·27) . . . . geometric mean relationship
   x = 9
 
        
             
        
        
        
answer:
15/8
- this is the simplest form. 
<em>-- please mark the brainliest and click the thanks button if correct :)</em>
<em></em>
 
        
                    
             
        
        
        
Answer:
I believe the answer is (-4,-1)
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
If im correct it will be no because...
18 x 3 = 54 
Now you do 
54 + 54 = 216 
I might be right or wrong (sorry if i got it wrong)
 
        
             
        
        
        
Answer:6018
Step-by-step explanation:
Given Sequence 

It represent an A.P. with 
first term 
common difference 
So sum of 51 term
![S_n=\frac{n}{2}[2a+(n-1)d]](https://tex.z-dn.net/?f=S_n%3D%5Cfrac%7Bn%7D%7B2%7D%5B2a%2B%28n-1%29d%5D)
![S_{51}=\frac{51}{2}\times [2\times (-282)+(51-1)16]](https://tex.z-dn.net/?f=S_%7B51%7D%3D%5Cfrac%7B51%7D%7B2%7D%5Ctimes%20%5B2%5Ctimes%20%28-282%29%2B%2851-1%2916%5D)
![S_{51}=\frac{51}{2}\times [-564+800]](https://tex.z-dn.net/?f=S_%7B51%7D%3D%5Cfrac%7B51%7D%7B2%7D%5Ctimes%20%5B-564%2B800%5D)
![S_{51}=\frac{51}{2}\times [236]](https://tex.z-dn.net/?f=S_%7B51%7D%3D%5Cfrac%7B51%7D%7B2%7D%5Ctimes%20%5B236%5D)

