A number line that correctly shows the ordering of the numbers from smallest to largest is shown below;
4/10, 3/5, 7/10.
A number line is a type of graph that is composed of a graduated straight line, which typically comprises both negative and positive numerical values that are located at equal intervals along its length.
This ultimately implies that, every number line would increase in number towards the right from 0.
Based on the information provided, we have the following numbers;
x = 7/10 = 0.7
y = 3/5 = 0.6
z = 4/10 = 0.4
Therefore, the ordering the number from smallest to largeest is 0.4, 0.6, 0.7 or 4/10, 3/5, 7/10.