The answer is 308.6, assuming you mean round it to the tenths place of course. :) The first digit to the right of the decimal place in any number is the tenths place, but if the number directly to the right of that is above 5, you must round it up. In this case, because it is 308.61, you need to round it down to 308.6
Edited because for some reason I read it as 306.61 instead of 308.61.
Oh I think is because when u write or draw a number line u write like 1,2,3,4,5 ... and -1,-2,-3... and so when u write point something....and so u have 0.6 and 0.25 and 0.6 is greater because it came first 0.6 came before 0.25
Step-by-step explanation:

Like other graphs, they use an x axis, and a y axis. It shows how one variable can affect another, hence the x and y (independent variable versus the dependent variable). With scatter plots you can use it to find a line of best fit that shows an average correlation relationship of the data. Scatter plots also allow you to find any outliers (those little dots that aren't in a pattern, correlation, or area with the majority of other points). It usually shows a relationship between TWO sets of data. :) :>
Hope this helps! :3 :>