Find parametric equations and a parameter interval for the motion of a particle that starts at (-a, 0 )and traces the circle x^2 + y^2 = a ^2.
a. once clockwise.
b. once counterclockwise.
c. three times clockwise.
d. three times counterclockwise.

what does x eaqual

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