What is the simplified form of the expression?

Which of the following is the formula for the sequence graphed below

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

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)