Determine if the function is concave up, concave down, or has no concavity:
Answer
f is concave down, because it looks like part of an upside-down bowl.
f is concave up, because it looks like part of a right-side up bowl.
f has no concavity, because it's a straight line.
f is concave down, because it looks like an upside-down bowl.
f is concave up, because it looks like a right-side up bowl.
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