Which expression is equal to 2 sine (StartFraction pi Over 10 EndFraction) cosine (StartFraction pi Over 10 EndFraction)?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

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?