What is the value of this expression when a=3 and b=-2 (3a^-2 b^6)^2 / 2a^-1 b^5= 1

Equals 1

Solve the system of equations. y= 2x y= x^2 - 15

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.

What are “like terms”? why can we only add like terms?