On week 10 of math 10 we’ve learned about domain and range. Domain is x and graph’s walls. Range is y, graph’s ceiling and floor. For example we have this graph: 
First we need to figure out where are the walls. We can see that graph ends with a solid dot on each side and if when we put two lines on these sides full graph is inside it means we found our domain. Now we need to write it down. If we look at x-axis we will see that our graph starts at -2 and goes to 4. Because our dots are solid we would write domain with “less than or equal to” sign.
Now we have to find range. We need to find our floor and ceiling. In this example our floor would be 0 and ceiling 3. Now we have to write it down. 3 is a solid dot so we will use “less than or equal to” sign. 0 coordinate is in the middle of the graph which means we will still use “less than or equal to” sign. If we do not see an open dot it means we will think it’s always solid.
