. Determine the center. radius, and graph of the given circles: a. (x9F+ (y+4)2= 25 b. x2+y2-4x+-5=IJ . Det. the focus and graph of the parabola given (x+1) + (yr-4)? = [I . A semi-circle whose perimeter is approximately 1510ch revolves about an axis passing through its center. Det. the volume of the sphere formed. . A cylindrical water tank with diameter of 6cm, 13cm high'is lled with water about 1/3 its height. If two pieces of solid balls. each with 61cm\" are completeiy submerged to the tank. Find the new height of the water inside the tank. . Det. the volume and total surface area of of the pencil shown