How can you estimate 1,506 divided by 2 so tha it is close to the actual answer of 753?

What is the factor form of x^2-9x+14

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?

Based on the diagrams, what is the value of x?