Answer:
Number line graph with closed circle on 30 and shading to the left
Explanation:
we know that
The algebraic expression of the phrase " An unknown number x is at most 30" is equal to
![x\leq 30](https://img.qammunity.org/2020/formulas/mathematics/middle-school/zy211p8sae5ijbzv1x1jp96uwd6kbz1kyv.png)
The solution is the interval ------> (-∞,30]
All real numbers less than or equal to 30
Number line graph with closed circle on 30 and shading to the left
see the attached figure