I need the answer please

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

What reaction is taking place? 02 + c3h8 = h20 + co2