Which expression is equivalent to 21 - (-5)? O A. -21 + 5
O B. 21 + 5
O C. -21 - 5
O D. 21 - 5

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?