Do 7 × ( 9 - 4 ) and 7 x 9 - 4 have the same answer? explain why

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.

Me asap! what is the slope of this line? enter your answer in the box.

Choose the more precise measurement. 26.4 cm or 8.39 cm