two times the sum of a number, x and 9 is at most four times the number. Write and solve an inequality to find to value of the number ​

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 inequality comparing two of the expressions is true when 0.7 < x < 0.9

Which equation represents a line that is parallel to the line whose equation is 3x-2y=7( show all work)