What is i to the 97th power minus i

Pls! does anybody know a shortcut for answering these types of questions in the future?

Write a story that matches with the expression 42x-5 pls hurry

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?