Which equation can be used to solve for xxx in the following diagram? Choose 1 Choose 1 (Choice A) A 4x = 180 + 5x4x=180+5x4, x, equals, 180, plus, 5, x (Choice B) B 4x + 5x = 1804x+5x=1804, x, plus, 5, x, equals, 180 (Choice C) C 4x + 5x = 904x+5x=904, x, plus, 5, x, equals, 90 (Choice D) D 4x = 5x4x=5x4, x, equals, 5, x

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What signals you that factoring by grouping is the best method to use when factoring a problem?

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?