Step-by-step explanation: When you are talking about age, that means time. Time is continuous, never stopping or slowing down for anyone. Therefore the graph should be continuous.
168cm2 Let r cm be the radius of the balloon, then <span>2pi(r)=23=>r=23/(2pi) </span> <span>The surface area= </span> <span>4pi(r^2)= </span> <span>4pi[23/2pi)]^2= </span> <span>(23^2)/pi=168.386 cm^2 </span> <span>approximately.</span>