Cierra needs 3000 mg of zinc for a science experiment which expression can be used to determine how many grams of zinc she needs
To determine how many grams of zinc Cierra needs, the following expression can be used:
3000 mg of zinc * (1 g / 1000 mg) = X grams
Where X represents the number of grams of zinc needed for the science experiment. This calculation converts the 3000 mg of zinc into grams by using the conversion factor of 1 g = 1000 mg.