Can someone answer this pls

Domain is

You'll check the box labeled "x", the box labeled and the box labeled "d". So you'll have 3 boxes checked.

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Explanation:

We cannot have a negative number under the square root, and get some real number output. For example, the result of isn't a real number.

That means we need to have the "x-d" under the square root to be 0 or larger.

The domain is telling us that x = d is the smallest x value we can plug in

So that's why we check off the box labeled "x", the box labeled and the box labeled "d" as shown below.

answer: 819.89 miles across america

step-by-step explanation:

the answer is 13 cm