What is the answer of 438 + 142

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

The longer leg of a 30-60-90 trangle is 18

This question is hard for me to answer can you me. the question is find the value of x.