When you define a subclass, like student, and don't supply a constructor, then its superclass must: 1. have no constructors defined2. have no constructors defined or have an explicit default (no-arg) constructor defined.3. have an explicit copy constructor defined4. have an explicit default (no-arg) constructor defined5. have an explicit working constructor defined

How many nibbles can be stored in a 16-bit word?

Why were most movies from the late 1890s until the early 1930s only filmed in black and white? there were only a few people who could afford the technology to produce color motion pictures back then. audiences did not want color motion pictures until later. the film used to make color motion pictures often overheated, which was a safety hazard, so it was generally not allowed. color films had to be hand-colored, frame by frame.

What are the most commonly found items in the trash according to the municipal solid waste report?