Suppose the value of a rare quarter is increasing exponentially. in 2009 it was worth
$0.80 and in 2010 it was worth $0.84. how much will it be worth in 2029?

? i've been staring at this question for half an hour by now : -|

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?

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

Yvaries directly as x. y =90 when x=6. find y when x=13