Kepler was born 7 years later than Galileo and Mirko 12 years earlier. If Kepler died aged 59 in 1630. How many years did Galileo live?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Two cities a and b are 1400km apart and lie on the same n-s line. the latitude of city a is 23 degrees. what is the latitude of city b. the radius of the earth is approximately 6400km.

In 2014, the three largest economies in the world were (listed in order, from largest): a) the u.s., china, germany. b) the u.s., china, japan. c) china, the u.s., japan. d) china, the u.s., germany.