Hello please help me
Idk if the answer is 16 or 19

4 - 16 ÷ 4 + 4²

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)?

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.