Simplify the radical expression that does NOT simplify to 10.

Answer:
A.
√10 ≈ 3
2 × 3 ≈ 6
√25 = 5
√4 = 2
5 × 2 = 10
[tex]\frac{300}{3}=100\\\sqrt{100}\\100=10^2\\\sqrt{10^2}\\\sqrt{10^2}=10[/tex]
[tex]1000=10^3\\\sqrt[3]{10^3}\\\sqrt[3]{10^3}=10(\mathrm{Radical\:rule)}\\[/tex]
Thus,
option A. is correct.