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Explanation:

An altitude goes from a vertex point to the opposite side, such that it is perpendicular to the opposite side. The square angle marker indicates we have a 90 degree angle, so DB is perpendicular to AC. The altitude of a triangle, DB, is the height of the triangle with base AC. The base and height are always perpendicular to one another.

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step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204