Calculate a country's GDP if for the year, consumer spending is $900 million, government spending is $250 million, investment by businesses is $180 million, exports are $85 million and imports are $100 million.
A ball, thrown vertically upward, rises to a height of 80 m and returns to its original position. The magnitude of its displacement after 7 s of motion will be ____. (take g = 10 m/s2)