Someone answer please:)
I think its saying to find out what a means

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.

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)

What two criteria are needed for triangles to be similar