Evaluate
6202.5 + 620.25 + 62.025 + 6.2025 + .62025

Answer: Option C

Explanation:

Can be easily solved with following formula
$$\begin{aligned} a^2 - b^2 = (a - b)(a + b) \end{aligned}$$

Answer: Option B

Answer: Option D

Explanation:

As per given equation we can solve like this :

$$\begin{aligned} = \frac{8 - 2.8}{1.3} \\ = \frac{5.2}{1.3} = \frac{52}{13} \\ = 4 \end{aligned}$$

Answer: Option A

Explanation:

$$\begin{aligned} 6.\overline{46} = 6 + 0.\overline{46} = 6 + \frac{46}{99} = 6\frac{46}{99} = \frac{640}{99} \end{aligned}$$

Answer: Option C