The class is about Electricity and Magnetism. The website wants exactly the perfect answer and in the same metric system units that are stated on the calculators that are on the picture for the question, if not, it'll mark it wrong.

Dimmer Switch 120 v Rbulb Some light dimmer switches use a variable resistor as shown in the gure above. The slide moves from position x : D to x = l, and the resistance up to the slide position x is proportional to x (the total resistance Rpm : 100 $2) Ifthe resistance of the bulb is Rm\