How many eighths make a quarter

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)?

Is this a polynomial function? i need to know asap

Witch represents the inverse of the function f(x)=1/4x-12