Answer:
T-X
Step-by-step explanation:
Today=T
Yesterday = X
To find the diffrence you need to subtract Today from Yesterday then you will get your answer
For this case we must find the inverse of the following function:

For this, we follow the steps below:
We change f (x) to y:

We exchange the variables:

We solve for y:

We divide between 8 on both sides of the equation:

We raise both sides of the equation to the square to remove the root:

So, the inverse is:
ANswer:
Option C
21g=84
g=84/21
g=4
The answer is B