Given a circle with a center at (1, 2) and a radius of 3, what would the equation of the circle be?

A.(x - 1)^2 + (y-2)^2 = 3
B.(x + 1)^2 + (y + 2)^2 = 9
C.(x - 1)^2 + (y - 2)^2 = 9
D.(x - 1)^2 + (y - 2)^2 = 6

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)