A teacher has 10 books (all different) that she wants to distribute to John, Paul, Ringo, and George, ensuring that each of them gets at least one book. In how many ways can she do this

What is a rational number between 9.5 and 9.7

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking