Hadeer decides to survey a random sample of students at her school about their favorite sport. There are 800 students in her school. Which of the following sample sizes would best represent the preferences of all the students at her school?

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?

Two sides of a right triangle measure 2 units and 4 units. what is the area of the square that shares a side with the third side of the triangle?

Twice the sum of a number and 2 is equal to three times the difference of the number and 8. find the number.