Determine if the following system of equations has no solutions, infinitely many solutions or exactly one solution.
4x + y = 1
20x - 6y = 5

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?

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i

The blue segment below is a diameter of o. what is the length of the radius of the circle?