Why do some children depart from accepted standard, often to the great harm of themselve and others?

When applying kirchhoff's rules, one of the essential steps is to mark each resistor with plus and minus signs to label how the electric potential changes from one end of the resistor to the other. the circuit in the drawing contains four resistors, each marked with the associated plus and minus signs. however, one resistor is marked incorrectly. which one is it?

If element x has 99 protons how many electrons does it have

How many atoms of nitrogen are in the chemical formula ni(w on