Which is in ascending order

Answer: Option C

Explanation:

9/11 = .818 , 8/9 = .88 , 3/5 = .6, 4/7 = .571

So order is 8/9 > 9/11 > 3/5 > 4/7

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

Explanation:

$$\begin{aligned} a^3 + b^3 = (a+b)(a^2 + b^2 - ab) \end{aligned}$$

$$\begin{aligned} = \frac{10.3^3 + 1^3} {10.3^2 + 1^2 - 10.3 \times 1} \end{aligned}$$

$$\begin{aligned} = (a+b) = (10.3+1) = 11.3 \end{aligned}$$

Answer: Option B

Explanation:

1/(60*60) = 1/3600 = .0027

Answer: Option A