Determine next 3 sequences of 1.1, 1.11, 1.111, 1.1111

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.

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5