The gradient of a straight line

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(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)