Find all complex numbers z for which (z-2)/(z 2) purely imaginar.

What are the relative frequencies, to the nearest hundredth, of the rows of the two-way table? group 1: a 15 b 45 group 2: a 20 b 25

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Me i'm timed right now! a. (0,-5)b. (0,-3)c. (0,3) d. (0,5)