Final answer:
The correct answer is option A) x ≥ -3 and x ≤ 9.
Step-by-step explanation:
The correct answer is option A) x ≥ -3 and x ≤ 9.
This represents the inequality for the sentence 'A number x is at least -3 and at most 9.'
The symbol '≥' means 'greater than or equal to,' and the symbol '≤' means 'less than or equal to.'
By combining these symbols, we can represent the range of values for x that satisfy the given sentence.
Therefore, the correct inequality is x ≥ -3 and x ≤ 9.