Which of the following intervals could the domain of y=secx be restricted in order to allow for the construction of its inverse function?

What is the solution of sqrt x+2-15=-3

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

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)