Final answer:
The variable 'a' represents the age of a citizen and the inequality 'a ≥ 35' expresses that a citizen must be at least 35 years old to run for the Presidency of the United States, as stated in Article II, Section 1, Clause 5 of the US Constitution.
Step-by-step explanation:
To write an inequality that represents the age requirement to run for the Presidency of the United States, first we must define a variable. Let's define the variable 'a' to represent the age of a citizen. The requirement states that a citizen must be at least 35 years old to run for President. Therefore, the inequality would be:
a ≥ 35
This inequality states that the age of the person 'a' should be greater than or equal to 35. This requirement is outlined in Article II, Section 1, Clause 5 of the US Constitution.