What is 100 divded by 5 times 4 plus 4 to the 3rd power

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Using only odd number for numerators write two different subtraction problems that have a difference of 3/4

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?