Which of these is an example of a random sample? A.
Every twentieth caller to an independent radio station receives tickets to a concert.

B.
A phone survey is conducted using twenty names randomly taken from the phone book.

C.
Customers buying a new cell phone are surveyed about cell phone plans.

D.
A phone plan company surveys people on the beach to see how well they are receiving service, and uses this information in future advertising.

Find the pattern and use it to list the nth term in the sequence. 6, 12, 20, 30, 42, 56, the nth term of the sequence is

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

Fred has a spinner that is split into four equal sections: red, blue, green, and yellow. fred spun the spinner 688 times. which of the following would be a good estimate of the number of times the spinner lands on the green section? a. 269 b. 603 c. 344 d. 189