Areas of rectangles with the same perimeter

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?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?