Classify each real number. List all the subsets in which the number belongs.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Aparallel system functions whenever at least one of its components works. consider a parallel system of n components, and suppose each component works independently with probability 0.5. find the conditional probability that component n works given that the system is working

What is the inverse of the function f(x) = 2x + 1?