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คณิตศาสตร์ มหาวิทยาลัย

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CONVERSATION A Match the sentence parts to complete the expressions of disagreement. 1. |donไ a. true. b. I disagree. 2. That's not 3. T'nา not C. what you're saying, but.. 4. I'm afraid d. So Sure about that. 5. | know e. agree. B Read the statements and give your opinion and a reason. If you disagree, uรe one of the expressions from A. Example: Yoนng people should get an apartment after they finish high school. |dont agree. Sone tcen.agers arcntrzady to live alone. 1. People shouldn't get married before they're 30 years old. 2. The best place for older people to live is with their children. 3. Mothers should not work outside the home. 4. People should live with their parents until they get married. 5. Small children should watch as much television as they want. 6. Couples with children should never get divorced. 7. Both boys and girls should help with the housework. 8. Day care is bad for children. 9. Both parents should work full-time.

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คณิตศาสตร์ มหาวิทยาลัย

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HN) Exercises (1)You take 200 milligrams of a headache medicine, and after 4 hours, 120 milligrams remain in your system. If the effects of the medicine wear off when less than 80 milligrams remain, when will you need to take a second dose, assuming the anmount of medicine in your system decays exponentially? 13 ส.ค. The half-life of Radium-226 is 1590 years. If a sample initially contains 200 mg. how many milligrams will remain after 1000 years? )The half-life of Fermium-253 is 3 days. If a sample initially contains 100 mg, how many milligrams will remain after 1 week? บ้อ The half-life of Erbium-165 is 10.4 hours. After 24 hours a sample still contains 2 mg. What was the initial mass of the sample, and how much will remain after another 3 days? The half-life of Nobelium-259 is 58 minutes. After 3 hours a sample still contains10 mg. What was the initial mass of the sample, and how much will remain after another 8 hours? (6) A scientist begins with 250 grams of a radioactive substance. After 225 minutes, the sample has decayed to 32 grams. Find the half-life of this substance. A wooden artifact from an archeological dig contains 60 percent of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years.)

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