What is the center of a circle whose equation is x2 + y2 + 4x – 8y + 11 = 0?

(–2, 4)
(–4, 8)
(2, –4)
(4, –8)

"how does lena finally defeat the robots? ” this question will best be used to describe the story’s exposition. rising action. climax. falling action.

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles