The vertex of the parabola described by the equation $y=-2x^2-12x-15$ is $(m,n)$. What is $m+n$?
Question:
The vertex of the parabola described by the equation $y=-2x^2-12x-15$ is $(m,n)$. What is $m+n$?
Answer:
Let's think step by step.

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The vertex of the parabola described by the equation $y=-2x^2-12x-15$ is $(m,n)$. What is $m+n$?
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