Which is a correct classification for the triangle

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 binomial expansion of (2x-3)^5

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.