A compound contains 42.1% sodium, 18.9% phosphorus and 39% oxygen. Determine its empirical formula(show all your work).

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

How have the greenhouse gasses increased from the year 2000 to 2018

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.