Find the distance between the two points rounding to the nearest tenth (if necessary). (4,2) and (1, -2)

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?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.