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To calculate the percentage increase<span>: First: work out the </span>difference<span> (</span>increase<span>) between the two numbers you are comparing. Then: divide the </span>increase<span> by the original number and multiply the answer by 100. If your answer is a negative number then this is a </span>percentage<span> decrease.
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The given statement is "nine times five less than twice x".
So, twice of x can be written as 2x and nine times five is 9*5.
Now 9*5 less 2x means we need to take out 9*5 from 2x.
Hence, this statement will be converted into an algebraic expression as follows:
2x-9*5
Question 1:
For this case we have the following functions:

We must find
):
By definition we have to:


We substitute
:

So, we have that 
Answer:

Question 2:
For this case we have the following functions:

We must find
:
By definition we have to:

We substitute
:

Answer:

Question 3:
For this case we must find the inverse of the following function:

To do this, we follow the steps below:
We change y for
:

We exchange variables:

We clear the value of the variable "y":

We change y for
:

Answer:
