Three pens and two pencils cost $1.05. Four pencils and two pens cost $1.10. What do 1 pen and 1 pencil cost?

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