Answer:
Step-by-step explanation:
arithmetic sequence is a sequence , if difference between any two consecutive terms is same for all.
difference of first two terms: -9.7-(-12.3)=2.6
difference of third and seconf term: -7.1-(-9.7)=2.6
and so o, as difference between any of the consecutive terms is same i.e 2.6, the given sequence is arithmetic.
