Answer:

Step-by-step explanation:

"To make x the subject" means to have the equation with all the terms in x on one side. As of now, y is the subject of the equation.
You start by subtracting 2 from both sides, you should get the following.

Then you multiply by 2 from both sides, you should end up with the following.

Therefore, you get the following.

Finally, you distribute and get the answer.

4% of $57.84
= 2.31 est. is sales tax
Let

In order to prove this by induction, we first need to prove the base case, i.e. prove that P(1) is true:

So, the base case is ok. Now, we need to assume
and prove
.
states that

Since we're assuming
, we can substitute the sum of the first n terms with their expression:

Which terminates the proof, since we showed that

as required