Mrs. Whitlow gives her dog, Ekon, a weekly allowance to spend on treats. This week, Ekon received $2.20 in nickels and dimes. If there is a total of 26 coins, how many of each coin did
Ekon get?

(Solve using systems of linear equation)

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?

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

Whoever gets this right gets the ! the half life of a soul smelling substance is 4 years. if you have 8 oz of this strange substance, how much of it will you have after 20 years? show work.