Isabella purchased 3 books from the book store. she now owns 11 books that she wants to read before the end of the year. if x represents the number of books she started with, which equation could be used to determine the value of x? a.) x-11=3 b.) x+11=3 c.) x+3=11 d.) x-3=11

Reflect the point (7,0) across the y-axis

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 the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.