What is the circumference of the circle in terms of ? a. 900 in.
b. 90 in.
c. 60 in.
d. 30 in.

Step-by-step explanation:

Given,

Radius = 30 in

So,

Circumference

step-by-step explanation:

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