4. A recommended dose of medicine is 5.0 mg per kilogram (mg/kg) of body weight. A patient weighs 125 pounds. The pills are sold 3 forms: 500 mg, 300 mg, and 100 mg. Which pill should
be prescribed?

C. control over the business

Oxygen= 88ghydrogen= 12g

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.