You are with a friend in the schoolyard. You rest your ear against a metal leg of the swings while your friend gently taps on the leg. You hear the tapping. Describe the wave produced by tapping. Is it a longitudinal wave or a transverse wave?

Asap! i'm not good math and i'm lost.

The graph of a hyperbola is shown. what are the coordinates of a vertex of the hyperbola? (0, −4) (−3, 0) (0, 0) (0, 5)

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?