The answer is $A = (3, 21)$.
Work Step by Step
Let's take a look at the figure. We know that the figure is a parallelogram. The $x$ coordinate does not change, since it is parallel to the y-axis. In order to compute the $y$ value, we add the value of the starting point, which is $7$, with the value of the length of the segment. The length of the segment is $14$, which we can compute by $15 - 1 = 14$. So we compute $ y = 7 + 14= 21$. This is the $y$ value of $A$ and $ A = (3,21)$.