a triangular prism is shown below. Each of the bases is shaped like an isosceles triangle 20 cm 5 cm 4 cm 6 cm 5 cm what is the total surface area of the triangular prism in square centimeters? A: 240 cm^2 B: 368 cm^2 C: 320 cm^2 D 344 cm^2

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?