D 51 +5
31 +9
In the figure, side AB is given by the expression 1 + 3 , and side BC is 21 – 4.
The simplified expression for the area of rectangle ABCD is
and the restriction on xis
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reserved.

1) is right

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

a long term investor

step-by-step explanation:

because he is a long term investor