What’s the average speed of swimmer A? Pls help

Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?

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.

Evaluate this exponential expression,8. (2 + 3)2 – 42