According to the passage, the
whistles are significant in part
because they:
a. show that dolphins
are capable of
expressing emotion
b. prompt questions
about the complexity
of dolphin
communication
c. aid dolphins in
navigating and
hunting
d. continue to spur
research into their
unknown purpose

correct answer:

a + bi

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be