Carla is riding a motorcycle across the country. after 4 hours, she is 600 miles from denver. after 8 hours, she is 320 miles from denver. what is the total distance, in miles, to denver from where carla started riding?

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)?

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax