Let sin a = 12/13 with 90º≤a≤180º and tan b = -4/3 with 270º≤b≤360º. find tan (a - b).

a) -63/65
b)56/33
c)-16/63
d)65/56

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?

Which of the following graphs could represent a cubic function?

Five friends found a dollar on the ground and decided they each should get 1/5 of it. what amount of money will each friend get? $0.05 $0.20 $0.30 $0.80