Consider n independent flips of a coin having probability p of landing on heads. say that a changeover occurs whenever an outcome differs from the one preceding it. for instance, if n = 5 and the outcome is hhtht, then there are 3 changeovers. find the expected number of changeovers. hint: express the number of changeovers as the sum of n − 1 bernoulli random variables.

Bella want to know what the students at her school think of her show. which is the best group to survey to find this information a. go to the mall and ask all of the students she recognizes from school b. ask her viewers to call in durning an episode of the show c. get a list of students at her school from the office and use a random number generator to pick 30 of them d. get a list of students at her school from the office and pick the first 30 students on the list

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

Point s lies between points r and t on . if rt is 10 centimeters long, what is st? 2 centimeters 4 centimeters 6 centimeters 8 centimeters