It due tomorrow plzz what is number 3 4 and 9 plzzz

What is the quadric regression equation that fits these data

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

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?