Jeremiah already knew 5 appetizer recipes before starting culinary school, and he will learn 3 new appetizer recipes during each week of school. After how many weeks of culinary school will Jeremiah know a total of 29 appetizer recipes?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?