You can only add exponents if you are multiplying two of the same variable together. For example,

You take them away if you are dividing.
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In a polynomial equation, you can add together two of the same variable if they have the same exponent
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Or you can take them away in a similar fashion,
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But you cannot add two (or more) different exponents,
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(it does not get any simpler)
I hope this has answered your question, if not, leave a comment and I'll update the answer.
Answer:
20%=8
10%=?
by cross multiplications,
10×8=80
80÷20=4
Hence the answer is 4.
Option C: 6 is the value of 
Explanation:
The given expression is 
We need to determine the value of 
To find the value of
, let us substitute
in the given expression.
Thus, substituting
in the expression, we have,

Adding the terms, we get,

Since, we know the absolute rule that
and the simplified expression is of the form
, let us apply the absolute rule in the simplified expression.
Thus, we have,

Thus, the value of
is 6.
Hence, Option C is the correct answer.
I don’t know what the options are but I think it is 95 because 120-25 = 95
To find f(g(x)), plug g(x) into f(x) and simplify.
f(x/2) = 2 - 1/(x/2)
All you have to do is simplify the right side of the equation.
Take it from here.