(HELP ME PLEASE)
I dont get this question.. can you explain it...

Which equation represents the partial sum of the geometric series?

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?