Solve the problem by applying the fundamental counting principle. how many different four-letter secret codes can be formed if the first letter must be an s or a t? (repetition is allowed.)

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t

In angle pqr find the measure of

Match the vocabulary to the proper definition. in probability, two events in which 1. conditional probability the outcome of one event is independent of the outcome of a second event. 2. dependent events in probability, two events in which the outcome of one event is dependent on the outcome of a second event. the probability of an event in which the outcome of the event is conditional on the outcome of one or more different events. 3. independent events