2n-5=21
add 5 to both sides
2n=26
divide both sides by 2
n=13
I hope I helped! :)
        
             
        
        
        
Hey there! :D
The biggest thing to remember here is the similar triangles and their side lengths. 
Okay, so we can separate these triangles into 3 similar triangles. Which, we only need to do that to two for a proportion, but if you were to have more variables, you could separate the triangles even more if you needed to. 
We want to find two triangles that have "x" has a value of their side, so we can solve a proportion. 
The bigger triangle, (the whole two triangles combine) and the smaller triangle on the left can be used to make a proportion.
On the smaller triangle:
We have 9 cm on the shorter side and x as the hypotenuse. 
On the larger triangle: 
We have x as the shorter side, and then 25 as the hypotenuse. (9+16)
Note: You have to flip the larger triangle upside down to make it a similar structure to the other two triangles. It is similar, you just have to flip it. 
So, now we can make a proportion. 

Now, cross multiply. 
9*25= 225
x*x= 

So, find the square root. 
√225= 15
x= 15. I hope this helps!
~kaikers
 
        
        
        
Answer:
- 3 < p < 4
Step-by-step explanation:
Given p is greater than - 3 then - 3 is less than p
- 3 < p < 4
 
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
             
        
        
        
Answer:
10 
Step-by-step explanation: