For the circle 2 +y + 20x - 8 y + 107 = 0, determine the following: (a) The radius of the circle. Enter your answer as a single value, DO NOT include r= in your answer. Number (b) Determine the coordinates of the centre of the circle. Enter your answer using round brackets and separate your coordinates with a comma. For example (3, -2)Which of the following equations are equations of a parabola? Assume that the constant c>0. Please select all the answers that apply. gy2+112+52-c=0 0 72 = cy+ 71 Jer+6y2 =5y lly =812 - 8x+c 0 62+c+ 792 =1leA parabolic lens is 100 mm deep and 420 mm wide at its top. How wide is the lens 41 mm above the vertex of the lens? Express your answer to three significant digits. Do not include units in your answer. 420 mm T 100 mm T 41 mm 200 0-200