Jacks are is three years more twice the age of his younger brother jimmy if the sum of their age is at most 18 find the greatest age that jimmy could be

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 expression is equivalent to sq-80

What is the rate of change of a line that passes through (2,-5) and (6,-2)?