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4-80.

Demarre and Alaysha are trying to decide where the graph of is concave up and where it is concave down. They both agree that it is concave up for , but Alaysha says that it can not be concave up for since the function is decreasing. Demarre says that it does not matter; all that matters is that it curves up. Who is correct? Explain your answer.    

A curve is concave up where it can be sketched as a portion of a "cup that is right side up".