The analysts at Swirlees, a brand of ice-cream, are asked to assess revenue generated over the past five years to observe seasonal and historical trends so that they can make a business estimate for the next year. After extensive analysis, they arrive at the conclusion that the sales were highest during the months of July and August, the summer months in the country, and an all-time low during January, the peak of winter. Which of the following tools would best help them in making an estimate for the upcoming year?
a. market basket analysis
b. goal-seeking analysis
c. what-if analysis
d. forecasting

Employees at a library check out books to patrons. books have an isbn and a name. the library sometimes has multiple copies of the same book. books have one or more authors. a patron is an individual who has an active (non-expired) library card. for each library card, we store the person's first and last names and their address. for each employee, we store their employee id, current salary, first and last name and their address. we also store the employee id of their current manager. each time we check out a book to a patron we need to store the date of the transaction, the employee who checked out the book to the patron, and the library card of the patron. some employees have library cards. if an employee patron turns in a book late, the fine that they pay is a percentage of their salary. some employees are authors who have library cards—they are allowed to check out as many books as they like.