Find the area of a regular pentagon with radius 9mm

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

Someone answer asap for ! the boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a. e = 2b - 212 b. b = 2e - 212 c. e = -2b + 212 d. b = -2e + 212