An airplane is flying 2250 feet in the air. a submarine submerged 1300 feet below sea level. what is the difference in elevation between the airplane and the submarine?

Which graph corresponds to the function f(x) = x2 + 4x – 1?

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?

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?