the answer is 470
Step-by-step explanation:Because 470+470 which equals 940 and the square root is 30
Answer is C. Definitely not d right off the bat because both exponents are negative so cross that out. After that its just counting zeros.

notice, it goes 4,6 then 4, 6 again, and so on and so on
based on whatever exponent it may have
now, you're being asked, what 214 will give? 4 or 6?
2000/200 is 100!! so it will be 100