What number would you add to both sides of x^2 + 7x = 4 to complete the square? a. 2^2 b. 7^2 c. 7^2/2 d. (7/2)^2

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?