Write the equation of the circle that has a center at point K (2, 4) and passes through the point (6,5).
(x + 2)2 + (y + 4)2 = 17
(x + 2)² + (y + 412 = 117
(x - 2)2 + (x-4)² = 17
(x-2)2 + (y - 472 = 117

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation