Is (9.1)^2=973.2 true or false

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.

Which graph corresponds to the function f(x) = x2 + 4x – 1?

Find the value of x. give reasons to justify your solutions! l, m ∈ kn