Which equation represents the general form a circle with a center at (–2, –3) and a diameter of 8 units? x2 + y2 + 4x + 6y – 51 = 0 x² + y² – 4x – 6y – 51 = 0 x2 + y2 + 4x + 6y – 3 = 0 x2 + y2 – 4x – 6y – 3 = 0

The lengths of two sides of a triangle are 9 and 15. what can be said about the length of the third side? a. it must be greater than or equal to 6 and less than 24. b. it must be greater than or equal to 6 and at most 24. c. it must be greater than 6 and less than 24. d. it must be greater than 6 and at most 24.