Coach decaro records the cross country runners' times compared to their personal best times.

runner

gregor

hiroki

isabelle

juan

karen

3k times

time compared to

personal best

+5.6

-11.6

+3.2

0

-5.2

which list correctly orders the runners from most improved to least improved?

juan, hiroki, karen, isabelle, gregor

juan, isabelle, karen, gregor, hiroki

hiroki, karen, juan, isabelle, gregor

gregor, isabelle, juan, karen, hiroki

The 4th list: Gregor, Isabelle, Juan, Karen, Hiroki.

Step-by-step explanation:

Times compared to personal best when arranged from most imporoved to least improved are:

+5.6, +3.2, 0, -5.2, -11.6

Now +5.6 is Gregors, +3.2 is Isebelle's, 0 is Jaun's, -5.2 is Karen's, and -11.6 is Hiroki's. Therefore, the list that orders runners from most improved to least improved is

Gregor, Isabelle, Juan, Karen, Hiroki

your answer would be 10x - 1

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80