The digits of a two-digit number sum to 8. when the digits are reversed, the resulting number is 18 less than the original
number. what is the original number?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second

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?