Union of Events and the Addition Rule

Two thousand randomly selected adults were asked if they think they are financially better off than their parents. The following table gives the two-way classification of the responses based on the education levels of the persons included in the survey and whether they are financially better off, the same as, or worse off than their parents.
Suppose one adult is selected at random from these 2000 adults. Find the following probabilities.

a. P(better off or high school)
b. P(more than high school or worse off )
c. P(better off or worse off )
The probability that an open-heart operation is successful is .84. What is the probability that in two randomly selected open-heart operations at least one will be successful? Draw a tree diagram for this experiment.