What is the value of the expression 18-2 times ( 4 +3)

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)?

Math i have no idea how to do a and b

The amount of data left on the cell phone six gb for 81.5 gb of data is used how much data is available at the beginning of the cycle