A hot air balloon is flying at an altitude of 800 feet. A passenger takes a picture of the top of a tree and estimates that the angle of depression to the top of the tree id about 43°. He estimated the angle of depression to the base of the tree to be 46°. What is the height of the tree?

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?