The half-life of a radioactive substance is 11 days. After 12 days a sample of the substance has been reduced to a mass of 4 mg.
What was the initial mass (in mg) of the sample?
Round your answer to 2 decimal places as needed.
N
Using your answer from above, after how many days will there only be 0.6 mg of substance left?
Round your answer to 2 decimal places as needed.
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Avegetable garden and a surrounding path are shaped like a square that together are 11ft wide. the path is 2ft wide. find the total area of the vegetable garden and path

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?

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