2) A chemist needs 140 milliliters of a 52% solution but has only 28% and 56% solutions available. How many milliliters of each should be mixed to get the desired solution? A) 30 ml of 28%; 110 ml of 56%
B) 20 ml of 28%: 120 ml of 56%
C) 120 ml of 28%; 20 ml of 56%
D) 110 ml of 28%, 30 ml of 56%​

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

christopher is 272,195 year old

step-by-step explanation: