What is the value of the expression √(81) + √(16)?

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To find the value of the expression √(81) + √(16), we first need to calculate the square roots separately.

Starting with √(81), we recognize that 81 is a perfect square. The square root of 81 is 9, because 9 multiplied by 9 equals 81.

Next, we evaluate √(16). Similarly, 16 is also a perfect square. The square root of 16 is 4, as 4 multiplied by 4 equals 16.

Now we combine these results:

9 (from √(81)) + 4 (from √(16)) equals 13.

Thus, the value of the expression is 9 + 4 = 13.

Considering the provided choices, 13 corresponds directly to the calculated sum, confirming that this is indeed the correct answer.