state the formula

There are 5 questions in total, 3 problem questions and 2 essay questions. Please answer all the 5 question. I need 450 words for each essay question total 900 words for both essay. For problem solving You must do the following.

1.state the formula. That is the statement that has the variables in it.

2. Substitute into the formula. That means you put constants/numbers in the place of variables

3. solve the problem.

I need the answer in a word file please.