All of the following expressions have a value of 3 except a -3(4 - 5) b |-2| + 1(3 - 2) c -8 ÷ -4 + 1 d 6 - 5 · 3

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 because some of question i don’t understand

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left