**must show step by step guide to how you got your answers**

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?

Which figures are polygons? select each correct answer. figure a figure b figure c figure d

Ahyperbola centered at the origin has a vertex at (-6,0) and a focus at (10,0). what are the directrices?