Can a sum of two equal vector be equal to either vector

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?

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight