Bree and Kendra love to go to the movies.  When they go, there is a probability of 0.3 that Bree will buy popcorn.  The probability that Kendra will buy popcorn is 0.35 if Bree buys popcorn and 0.65 if Bree does not.  When Bree and Kendra go to the movies together, find the probability that 1. both buy popcorn; 2. neither buys popcorn; 3. exactly one of them buys popcorn. Hint: Set up a probability tree diagram

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