Jonathan leans three playing cards against each other to form a triangle. He uses three more playing cards from the
same deck to form a second triangle. Which statement is
true?
Select one:

The two triangles must be congruent because the
corresponding sides in both triangles are congruent.

The two triangles cannot be congruent because sides cannot
be used to prove congruency.

In order to determine if the two triangles are congruent,
Jonathan must measure all three interior angles.

In order to determine if the two triangles are congruent,
Jonathan must measure one interior angle.

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?