Tableau de variations-positivité I

Le tableau de variation de la fonction continue f entre et 20 est le suivant :
La fonction f est-elle positive ou nulle sur [ ,20] ?

Enter your reply:
I have no idea
none of the above is correct

Remark. Choose 'none of the above is correct', if you think that the correct choice is not among those presented.

This is exercise number 1 in a series of 6 exercises.
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  • 6

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