Since this is for a class lets get the terms right.

When talking about alternating current (like audio signals) Ohms measures impedance, not resistance. Resistance only applies with the phase angle is constant at 0 degrees, i.e. DC.

And speakers don't "pull" anything. They are simply there to impede the flow of current from one pole of the output to the other. If the speaker wasn't there, and speaker wire was made into a dead short (milliohms) the amp would self destruct (or more likely go into protect) because the current flow would be so high.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs