PLEASE I NEED HELP. Which expression
uses the associative property to make it easier to evaluate
140 . )?
A. (141)
O B.76 : )
C. (143)
O D. 14 : )

How do you solve a question like this?

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?

Which of the following equations is equivalent to x/3-6/x=1