What is happening in the graph shown below? A. The object is moving at a constant speed toward its starting point. B. The object is standing still. C. The object's speed is changing. D. The object is moving at a constant speed away from its starting point.

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As cooking food that has to go in the oven

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.