Final answer:
The altitude of Polaris when observed from a latitude of 64 degrees is approximately 64 degrees above the horizon.
Step-by-step explanation:
The altitude of Polaris for a given latitude is essentially the same as the observer's latitude. If you have a latitude of 64 degrees, that means observing from that point on Earth, the altitude of Polaris above the horizon will also be around 64 degrees.
This is because Polaris is located nearly at the north celestial pole, so it appears above the northern horizon at an angular height, or altitude, equal to the observer's latitude. This is a direct result of Earth's rotation axis pointing towards Polaris.