The cost of a long distance phone call using company A's calling plan is $3.90 plus $0.35 per minute. How many minutes was a long distance phone call made using company A's calling plan if the total cost was $38.90?

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

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?

The equation of line wx is y=2x-5. write an equation of a line perpendicular to line wx in slopeintercept form the contains points (-1,-2)