A patio is being made with two different coloured paver stones. One colour is to be used for the boarder while the other is for the inside portion. The outside dimensions of the patio are 8 m. The boarder is to be 1.5 m wide. Determine the area of stone required for the inside portion.

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

answer: the correct answer is -32

step-by-step explanation: