how do i solve this infinite geometric series? 64/25-16/5+4-5

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! (:

i think that you should ask google for the answer to that problem because if we don't know it google does