Acircuit contains three light bulbs in parallel. after observation, a fourth light bulb is added, also in parallel. how does the intensity of the four light bulb circuit compare with the intensity of the three light bulb circuit?

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west