A local fast food restaurant takes in $7,500 in a 3 hour period. Write a direct variation equation for the relationship between income and number of hours. Estimate how many hours it would take the
restaurant to earn $20,000.

The head librarian at the library of congress has asked her assistant for an interval estimate of the mean number of books checked out each day. the assistant provides the following interval estimate: from 740 to 920 books per day. what is an efficient, unbiased point estimate of the number of books checked out each day at the library of congress?

What is the 12th term of b(n)=-4-2(n-1)

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?