A mine worker discovers an ore sample containing 500mg of radioactive materials. It is discovered that the radioactive material has a half-life of 2 days. Find the amount of radioactive material in the sample in the beginning of the 14th day.

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint