True or false: the more matter a star contains, the longer it is able to shine. Pls help fast

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

What three natural resources are found in the great lakes region

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?