The cube root of .000216 is

Answer: Option C

Explanation:

$$\begin{aligned} = \sqrt{248+\sqrt{64}} \end{aligned}$$

$$\begin{aligned} = \sqrt{248+8} \end{aligned}$$

$$\begin{aligned} = \sqrt{256} \end{aligned}$$

$$\begin{aligned} = 16 \end{aligned}$$

Answer: Option A

Explanation:

$$\begin{aligned} 3600 = 2^3 \times 5^2 \times 3^2 \times 2 \end{aligned}$$
To make it a perfect cube it must be divided by
$$\begin{aligned} 5^2 \times 3^2 \times 2 = 450 \end{aligned}$$

Answer: Option C

Explanation:

21*21*21 = 9261

Answer: Option C

Answer: Option D

Explanation:

$$\begin{aligned} = \sqrt{.000064} \end{aligned}$$
$$\begin{aligned} = \sqrt{\frac{64}{10^6}} \end{aligned}$$
$$\begin{aligned} = \frac{8}{10^3} = .008 \end{aligned}$$
$$\begin{aligned} = \sqrt[3]{.008} \end{aligned}$$
$$\begin{aligned} = \sqrt[3]{\frac{8}{1000}} \end{aligned}$$
$$\begin{aligned} = \frac{2}{10} = 0.2 \end{aligned}$$