Solve the problem by applying the fundamental counting principle. how many different four-letter secret codes can be formed if the first letter must be an s or a t? (repetition is allowed.)

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.

Which statement accurately explains whether a reflection over the y axis and a 270° counterclockwise rotation would map figure acb onto itself?