Please help with this I really mean it because if its wrong I fail​

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.

How do you solving the solution of each system using elimination?

Do you mind if you guys me with this question i’m on number 8