First four terms of the sequence represented by the expression n(n-1)-4

Which of the following equations is of the parabola whose vertex is at (2, 3), axis of symmetry parallel to the y-axis and p = 4? a.)y-3 = 1/16 (x-2)^2 b.)y+3 = -1/16 (x+2)^2 c.)x-2 = 1/16 (y-3)^2

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Ineed to know the answer to this algebra question.