What are the center and radius of the circle defined by the equation
x2 + y2 - 6x+8y +21= 0 ?

Which of those sequences is a geometric sequence

Which statement about perfect cubes is true

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte