What is... 5 x 10? this is for easy points

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?

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?

Find the circumference of a pizza with a diameter of 10 inches round to the nearest tenth