Help please!! Kassandra wears two types of hair bands, large and small. She has a total of 50 hair bands. The large ones cost $3 each and the small ones cost $1 each. So far she has spent a total of $106. How many of each type does she own?

An incoming airplane is x miles due north from the control tower at an airport. a second incoming airplane is y miles due east of the same control tower. the shortest distance between the two airplanes is z miles. which of the following functions would best model the situation above?