Answer:
im pretty sure this is choice A
Step-by-step explanation:
plz give brainleist i only need 1 more and need more points :)
The main rules that we use here are :
i)

for nonnegative values a and b.
ii)

.
Thus, first 'decompose' the numbers in the radicals into prime factors:

.
By rule (i) we write:

.
We can collect these terms as follows:

, and by rule (ii) we have:

Answer:

.
the answer is 470
Step-by-step explanation:Because 470+470 which equals 940 and the square root is 30