Sam wanted to know how much the price of milk had changed over the last few decades. He found that the price of a gallon of milk was $0.80 in 1970 and in 1990 it was $1.20.What was the average rate of change in a gallon of milk per year?

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?