X+y=k
x - y = k
the solution to the system shown is
(
ok)
(2, 2)
(k.)

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

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?