Pre-Calculus

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(a) Find the magnitude of...

(a) Find the magnitude of an earthquake that has an intensity that is 38.25 (that is, the amplitude of the seismograph reading is 38.25 cm). (Round your answer to one decimal place.)(b) An earthquake was measured to have a magnitude of 4.5 on the Richter scale. Find the intensity of the earthquake. (Round your answer to one decimal place.)-Radium-221 has a half-life of 30 sec. How long will it take for 82% of a sample to decay? (Round your answer to the nearest whole number.)

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