Rewrite the following equation in the center-radius form of the equation of a circle.
x2 - 6x + y2 - 8y + 21 = 0

A.
(x - 5)2 + (y - 3)2 = 4
B.
(x - 6)2 + (y - 8)2 = 4
C.
(x - 3)2 + (y - 4)2 = 4
D.
(x - 4)2 + (y - 6)2 = 4

Roger and natalie travel in similar cars. roger's car drives the two miles to school in 7.5 minutes. natalie drives the same distance in the opposite direction but in only 6.5 minutes. what is true of their velocities?

Given the statements, "a square root of 16 is 4," and "a square root of 9 is -3," complete the following blanks with the correct truth-values. p is and q is , so the statement, "a square root of 16 is 4 or a square root of 9 is -3" is .

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.