Im helping my little cousin do his math the yellow highlighted ones need to be checked. (NOT THE RED HIGHTAILED ONES)

Which of those sequences is a geometric sequence

What is the range for 31,39,29,34,37,24,36,33,34,28

Which best describes the function on the graph? direct variation; k = −2 direct variation; k = -1/2 inverse variation; k = −2 inverse variation; k = -1/2