When graphing transformations should I multiply or divide for a vertical stretch of 2?

And explain how you got it so i can understand future problems : 3

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

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