Throughout his life Baichu's heart has beat at an average rate of 72 beats per minute. Baichu is sixty years old. How many times has his heart beat during his life? Give the answer in standard form correct to 2 significant figures.

Without any equipment, you can see stars that are 2{,}800{,}0002,800,0002, comma, 800, comma, 000 light-years away. by looking through a small telescope, you can see stars that are 3{,}112{,}000{,}0003,112,000,0003, comma, 112, comma, 000, comma, 000 light-years away. approximately how many times as far can you see using a small telescope as without any equipment?