We want the ratio of seashells to pink she sells to be 3: 7 we should use 40 shells. how many orange shell should we paint.

set up the equation as 3x+7x=40

so that means 10x=40, so x would equal 4

so there would be 12 orange and 28 pink

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