Please answer in simplified, rationalized form and don’t round

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.

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

What is coefficient of the term of degree of degree 5 in the polynomial below