Find a number that becomes 585 when increased by 8 1/3%

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?