What should be subtracted from 15, 28, 20 & 38 so that the remaining numbers are in Proportional (a) 2
(b) 4
O a 6
(d) none​

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: 72: 111

step-by-step explanation:

the answer is b 4pi/3

got it down chief.

step-by-step explanation:

your answer would be c