Answer:
Sequence 1: arithmetic; Sequence 2: Geometric
Step-by-step explanation:
An arithmetic sequence is one in which each term is found by adding a constant to the previous term. In sequence 1, we see that we add -16 to each term to find the next one; that makes this an arithmetic sequence.
A geometric sequence is one in which each term is found by multiplying a constant to the previous term. In sequence 2, we see that we multiply 0.5 by each term to find the next one; that makes this a geometric sequence.