Is this a function? Input: students first name, Output: students favorite color

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

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.

Factor this polynomial completely x^2-64