Write the statement as a biconditional.

points in quadrant upper i have two positive coordinates.
choose the correct answer below.
a.
upper a point is in quadrant upper i if and only if it has two negative coordinates.
b.
if a point has two positive coordinates comma then it is in quadrant i.
c.
if a point is in quadrant upper i comma then the point has two positive coordinates.
d.
upper a point is in quadrant upper i if and only if it has two positive coordinates.

Which of the following is a justification used while proving the similarity of triangles lom and mon

Using elimination, what is -4x+2y=-12 4x+8y=-24

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?