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AP Calculus AB/BC
A decreasing function is a function in which the y-values decrease as the x-values increase. In other words, as you move from left to right on the graph, the curve slopes downward.
A function where y-values increase as x-values increase.
Monotonic Function: A function that either always increases or always decreases; it does not change direction.
A point on a curve where the concavity changes, from being upward to downward or vice versa.