16. Calculate $$\sqrt{4900} + \sqrt{0.49}$$.

Let's solve this step-by-step:

1. We need to calculate $$\sqrt{4900} + \sqrt{0.49}$$.
2. First, calculate $$\sqrt{4900}$$. We know that $$\sqrt{49} = 7$$, and $$\sqrt{100} = 10$$. So, $$\sqrt{4900} = \sqrt{49 \times 100} = \sqrt{49} \times \sqrt{100} = 7 \times 10 = 70$$.
3. Next, calculate $$\sqrt{0.49}$$. We know that $$0.7 \times 0.7 = 0.49$$. So, $$\sqrt{0.49} = 0.7$$.
4. Now, add the two results: $$70 + 0.7$$.
5. $$70 + 0.7 = 70.7$$.

Ответ: 70.7