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Answer: Choice D. 
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This is because we want to avoid having negative numbers under the square root. So we make the radicand to be 0 or larger.
The +1 at the end doesn't affect the domain.
Answer:

Step-by-step explanation:
×
×
× 
1 × 1 × 1 × 1 = 1
3 × 3 × 3 × 3 = 81

Answer:
6.2 percent
Step-by-step explanation:
47.81 - 45 = 2.81
2.81/45
I thought it would be 10 percent but my cal. says 1.44