Can someone help me answer this?? I am confused...

Pat is trying to pass a competency examt Each time she takes the exam she has a 40% chance of passing. She is allowed a maximum of two attempts. Draw a tree diagram to represent her attempts to pass the exam and answer the following questions. (a) How many outcomes does your tree show? (b) What is the prabability she will eventually pass the exam? (c) What is the probability she will take the exam exactly twice? (d) What is the expected value for the number of times she will take the exam? (2) What Is the expected value for the number of times she will fail the exam