A painter mixes gray paint by using 1 gallon of black paint for every 7 gallons of white paint. How much black paint and how much white paint will the painter need to mix 20 gallons of gray paint.
? Gallons of black paint
? Gallons of white paint

b

step-by-step explanation:

your answer is a

step-by-step explanation:

4*4*4*4=256

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