Exponents are evaluated first according to the order of operations

In which Mac OS did Apple introduce its first Unix-based operating system?

a. Mac OS X b. System 7 c. Mac OS 8 d. System 2.1

Which of the following applications would a deque not be well suited for?

a. Applications that require frequent insertions and deletions at the front of a container. b. Applications that require frequent insertions and deletions in the middle of a container. c. Applications that require frequent insertions and deletions at the back of a container. d. Applications that require frequent insertions and deletions at the front and at the back of a container.