The length of a rectangle is the sum of width and 1. the area of rectangle is 20 units. what is the width, in units, of the rectangle

What are the domain and range of the function f(x)=2^x+1

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

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?