Point r is at 3, 1.3 and point t is at 3, 2.4 on a coordinate grid. what is the distance between the two points?

They're both wrong, it's a simple question. Since they're both at the same X-Axis. You take the biggest of the y's and subract it by the smaller number. Therefore you take 2.4 - 1.3 and you get 1.1. The distance between the two points is 1.1 

The answer to your question is the last one