How to find exterior angle (8th grade math i really need with this i wasn't paying attention when we learned about this and it is on my hw)

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)?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq