Mark M. answered 09/13/21
Retired math prof. Very extensive Precalculus tutoring experience.
a. 0/1 = 0
b. 1/1 = 1
c. could be ∞ or -∞ or nonexistent depending on the behavior of q(x) as x → c
d. 0/0 is an indeterminate form. Further analysis is needed to determine whether or not the limit exists.