Answer:
Simplify
Observe that all roots are similar, because they are square roots.
To simplify this products, we can write only one root and multiply all sub-radical numbers, as follows
It's better to maintain the product as factors, so, let's express each number in a power
Then, all square powers can go out the root
Therefore, the answer here is
Simplify
Observe that all roots are exactly the same, we proceed to sum and subtract the whole part of each term
Therefore, the answer is
Which expression is equal to
Let's express each root in factors
Then, we solve the root for 4 and 9
Then, we subtract
Therefore, the right answer is D.