The number of plants in a terrarium is given by the function $P(c)=-1.4 c^{2}+3 c+15$ , where c is the number of mg of plant food added to the terrarium.Find the amount of plant food that produces the highest number of plants.Round to 2 decimal places.

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The Answer of The number of plants in a terrarium is given by the function $P(c)=-1.4 c^{2}+3 c+15$ , where c is the number of mg of plant food added to the terrarium.Find the amount of plant food that produces the highest number of plants.Round to 2 decimal places.

The Number of Plants in a Terrarium Is Given by the Function