Help Please!! I'm confused about this... (you can explain or screenshot the graph and show where the points are)

anyone? find the second, fifth, and ninth terms of a sequence where the first term is 65 and the common difference is -7. 72, 93, 121 72, 79, 86 58, 37, 9 58, 51, 44

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?