Shane covered a 10 ft. by 14 ft. wall with wall paper. To match the pattern,
he bought 20% extra. Each roll of
paper covers 30 ft2
How many rolls of wall paper did
Shane buy?

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?