When solving the following system of equations which variable would be the easiest to solve for? below 5x+3y=22
4x-2y=16
a. the x in the second equation
b. the y in the first equation
c. the y in the second equation
d. the x in the first equation

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

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?