Angle A and Angle F the ones that are red

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

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?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6