Can someone help me pls with full explanation will mark and 15+ points (only number 5)

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.

What is the difference between the equations of a vertical and a horizontal line?

What is always true about a positive integer raised to a negative odd power?