Given that linead is the perpendicular bisector of line bc, ab = 2a+7, and line ac=6a-21, identify line ac

Given the graph below state whether or not the relation is a function, and give the domain and range.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

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?