Three-eighths of the sum of sixteen times a number and twenty-four. how do you set this up?

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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?