Select all that apply. to solve an equation with a variable, which of the follow are done? inverse operations are used addition is always used the variable needs to be isolated the value of the variable should be guessed first

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)?