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After 3 days a sample of radon-222 decayed to 58% of its original amount. (a) What is the half life of radon-222? (b) How long would it take the sample to decay to 10% of its original amount? 173. Polonium-210 has a half life of 140 days. (a) If a sample has a mass of 200 mg find a formula for the mass that remains after t days. (b) Find the mass after 100 days. (c) When will the mass be reduced to 10 mg?
80% of all California drivers wear seat belts.If three drivers are pulled over , what is the probability that all would would wearing their seat belts? write as a percent to the nerest tenth.
Important information about Probability : Random Selection, A man has been guessing colors of cards drawn from a standard deck of cards. During the first 50 draws he kept track of the number of cards of each color
What is the probability that more than one machine is in the system? What is the probability that more than two are broken and waiting to be repaired or being serviced, as well as three and four machines?
A manufacture has been selling 1500 television sets a week at 450 each. A market survey indicates that for each 29 rebate offered to a buyer, the number of sets sold will increase by 290 per week.
By the Mean Value Theorem, we know there exists a c in the open interval (-20) such that f(c) is equal to this mean slope. Find the value of c in the interval which works.
Water is pumped out of a holding tank at a rate of 6 - 6e-0.14t liters/minute, where t is in minutes since the pump is started. If the holding tank contains 1000 liters of water when the pump is started, how much water does it hold one hour later?
A boat tied up at a dock bobs up and down with passing waves. the vertical distance between its high point and its low point is 1.8m and the cycle is repeated every 4 s. what is the sinusoidal equation?
Which of the following shows the equation balanced?
N(x)=-0.4x^2+8.8x+14 where x is the number of days since a concert was announced; when will sales peak and how many tickets will be sold.
How much money should be deposited in the bank at 2% interest compounded annually in order to be able to supply the money for the scholarship at the end of each year?
most people work full time 43.4 hours normally distributed. 12% work 48 hours per week what is the standard deviation of number of hours worked per week.
Suppose that a tribal culture was discovered in the South Pacific whose language consists of only eight letters
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