Max value 6; x-intercepts -2 and 4. Find the equation in vertex form

The parabola opens: y=√x-4 (principal square root) up down right left

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)

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x