My sister needs help ( casandra0606 )

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.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.