Could someone help me with this? It would be much appreciated. (Photo Attached)

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

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?

What is the perimeter of an equilateral triangle if each side is (x+3)?