Select all or the following ordered pairs that are solutions to the inequality (0, 0) 20,0) (20,80) (80, 20) (80,0)

Plz hurry evaluate the expression a+b where a=8 and b=19

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 sum of these mixed numbers 4 2/3+ 3 1/9