Preliminary, non-experimental, research that gathers information about behavior is called
research.

The best way to get your proper balance of vitamins and minerals is to eat a well balanced meal.
<span>A can of soup provides 4 servings and has 100 kcal per serving, how many kcal are in the entire can?
100*4=400 kcal
</span>
A quantity that does not equal 0, a real nonzero number must be positive or negative and a complex nonzero can have real or imaginary parts