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Use the concavity theorem to determine the interval Previous Question on is concave up and where it is concave down. Also find all inflection

Use the concavity theorem to determine the interval Previous Question on is concave up and where it is concave down. Also find all inflection points. f(x)=(4x-5) Select the correct choice below and, if necessary, fill in the answer box within your choice. OA. The function is concave up on (Type your answer in interval notation.) OB. The function is not concave up on any interval.

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