If the system of equation 2x+3y=7 and 29x=+(a+b)y=28 has infinitely many solutions then

(a)a=2b (b)b=2a

(c)a+2b=0 (d)2a+b=0

pls explain why along with answer

pls ask

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

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step-by-step explanation: