Whats y=x^2+x-1 in function notation

Classify the following triangle check all that apply

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)

We just started the introduction into circles and i have no idea how to do this.