The theoretical domain is all real numbers greater than or equal to one and less than or equal to two. Then the correct option is C.
What is inequality?
Inequality is simply a type of equation that does not have an equal sign in it. Inequality is defined as a statement about the relative size as well as is used to compare two statements.
Kellen runs for at least 1 hour but for no more than 2 hours. He runs at an average rate of 6.6 kilometers per hour. The equation that models the distance he runs for t hours is d = 6.6t
Then the domain of the function d will be a real number.
But in the problem, the value of t is more than or equal to one but less than or equal to two.
1 ≤ t ≤ 2
More about the inequality link is given below.
https://brainly.com/question/19491153
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