I need help guys thanks so much

What is the solution to the equation e3x=12? round your answer to the nearest hundredth

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

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?