At sea level, water boils at 100ºC. At an elevation of 500 meters, however, water will boil at 98.4ºC. Why do you think elevation impacts the temperature at which water boils?

Idid the calculation and i get 875,000,000 which can be written as 8.75 x 10^6?

Green is technically every other color but green but the other wavelengths of the other colors get absorbed by the object and the wavelength of the color green gets reflected

I'm sorry but i'm only grade

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.