If rectangle QRST is dilated by a scale factor of 3 through the origin, which of the following points represent the coordinates of Q'?

A. (3,21)

Step-by-step explanation:

scale factor: 3   (x',y') = (3x,3y)

(1,7) -> (3,21)

the distance from any point on the parabola to the focus is the exact same as the distance from that point to the directrix.

if you could provide answer choices that might allow me to answer the question easier if my above answer isn't an option! (: