In right triangle ABC the altitude CH to the hypotenuse AB intersects angle bisector AL in point D. Find BC if AD=8 cm and DH=4 cm

What properties allow transformation to be used as a problem solving tool

If g^-1(x) is the inverse of g (x) which statement must be true

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?