The coordinates of two vertices of a right triangle are shown on the grid. у
А
(-2,5)
5
4
3
2
1
X
-5-4-3-2-10
- 1
1 2 3
4 5
-2
-3
-4
B В
(5, -3)
-5
Which could be the coordinates of the right triangle's third vertex?

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?