The grades on the last history exam had a mean of 75%. assume the population of grades on history exams is known to be normally distributed with a standard deviation of 7. what percent of students earn a score between 70% and 82%?

Ineed i been stuck on this question since yesterday

The pyramid shown has a square base that is 24 centimeters on each side. the slant height is 16 centimeters. what is the lateral surface area?

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.