Simplify the following
8 (a+b)-3(a-b)
21p-p(6-3k)
3(2x+5y)+2(3x-2y)
7a-(3a-2b)

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?

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list