Please Help me for 18 points

Solve the triangle. a = 21°, c = 105°, c = 5

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

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?