Please help me due in 20 minutes.

When is an original work considered public domain? a. when posted via social media b. when it is posted on the internet c. when a copyright symbol is not included with the piece of work d. when explicit permission is given by the author / owner

What is a number system, and what is the total number of digits used in this system called? a number system is a system that uses different (options: a) numbers b) symbols c) codes d) digits e) alphabets) to represent different numbers. the total number of digits used in a number system is known as its (options: 1) processor 2) converter 3) radix 4) least significant digit 5) most significant digit)

Kou converged his word document to a powerpoint document. when he received the powerpoint, he was missing material. which most likely explains why the material was missing? a it did not have a proper heading b he incorrectly copied and pasted it c he did not save his document properly d there was not enough space in powerpoint