Two curves are orthogonal if their tangent lines are perpendicular at each point of intersection. show that the given families of curves are orthogonal trajectories of each other; that is, every curve in one family is orthogonal to every curve in the other family. sketch both families of curves on the same axes. x² + y² = ax , x² + y² = by

Which statement best explains why ben uses the width hi to create the arc at j from point k

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.

Math i have no idea how to do a and b