I am trying to find average velocity using x and y coordinates. My calculus book does not show how to solve the equation v(ave) = {s(t)-s(a)]/t-a The position at time t is s(t) = t3
I'm to estimate the velocity at time t=2
The coordinates are [2,2.001]

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?