What is the center of the circle given by the equation below?
x2 - 6x = -y2 - 12y - 9

A.
(3 , -6)
B.
(-3 , -6)
C.
(3 , 6)
D.
(-3 , 6)

The amount of energy it takes to lift a box might be a function of which of the following

Is a positive integer raised to a negative power always positive

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).