Hi, I need help with these questions Given the endpoints of a diameter, write an equation for the circle. a) (-3,5) and (1,3) I tryed this m= (x1+x2)/2, (y1+y2)/2 = (-3+1)/2 , (5+3)/2 = -2/2, 8/2 = (-1,4) ( x-h)^2 + (y-k)^2=r^2 (x+1)^2 + (y-4)^2=r^2 (1+1)^2 + (3-4)^2=r^2 (2)^2 + (-1)^2=r^2 5=r^2 so, (x+1)^2 + (y-4)^2 = 5 but, this answer in the back of the book is different so can someone tell me what to do? and 1. how do you simplify root 50 2. is rise y and run x? *** when a stone is dropped in a lake, circular waves or ripples are created. The enrey point of the stone marks the center of the circles. Suppose the radious increases at the reate of 20cm/s. write anequation for the outermost circle 2.5s after the stone hits the water. 20*2.5=50cm X^2 + Y^2=50^2 X^2 + Y^2=2500 is that right?