Four billion, five hundred and seventy million. write this number in figures​

4,575,000,000

Step-by-step explanation:

It's 4,570,000,000.

Step-by-step explanation:

The first guy had a typo right after the 7.

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