A ratio that is equivalent to 20% is
1:5
2:10
3:15
4:20
5:25
6:30
Ect..
Answer:
We have the value as 3m-7
Step-by-step explanation:
It is given that we have the real number m. Now we are required to find the simplified form or the value of the expression: 
Thus we can write it as:

Here we have to use the property:

So now we have:

So this is the required final value of the expression.
Using the edge lengths already given, I calculated the height of the right side of the irregular octagon by adding the heights on the left. Since they added to 9m, then I put 9 on the edge with a missing height. To find the missing length, I subtracted the quantity of 6+6 from 18 (you can also divide 18 by 3) to get 6. Now that I know all the lengths, I can add them to get the perimeter. Since 3+3+3+6+6+6+9+18, or (3*3)+(6*3)+9+18 is equal to 54, our answer is 54.
The given expression is 
We need to determine the expression as an equivalent algebraic expression involving only x.
The expression
has to be expressed as an algebraic expression in x.
Thus, we have;

Using the identity
in the above expression, we get;

Simplifying, we get;
![\cos \left(2 \cos ^{-1} x\right)=2[cos(cos^{-1}x)]^2-1](https://tex.z-dn.net/?f=%5Ccos%20%5Cleft%282%20%5Ccos%20%5E%7B-1%7D%20x%5Cright%29%3D2%5Bcos%28cos%5E%7B-1%7Dx%29%5D%5E2-1)


Hence, the expression
can be written as 