The sums of which two pairs from the table will give you the same result? For example, A + B = C + D.

Complex Numbers
A 7 − 3i
B −5 − 8i
C 12 + i
D −4 + 9i
E 6 − 6i
F −9 + 15i
G 1 + 10i
H 11 − 12

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

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?