Select all of the true statements. is the area of a circle of radius 1.
is the area of a circle of diameter 1.
is the circumference of a circle of radius 1.
is the circumference of a circle of diameter 1.
is the constant of proportionality relating the diameter of a circle to its circumference.
is the constant of proportionality relating the radius of a circle to its area.

answer: x

step-by-step explanation:

i think is 3 and 6. this took me 10 min to think.hope to and hope that my answer is brainliest.(follow me )

no this is a nonlinear negative

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