Find an exponential function of the form f (×)=ab^-× +c that has a horizontal asymptote y = 57, a y intercept 219 and passes through point to (2,107)

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

What is the range? can’t seem to find it out

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?