Solve the following equation for a.

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?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Explain how you can use the associative property to evaluate (7x50)x4.