#### Answer:

Cube of a number is given by the number raised to the power three.

(i) $\mathrm{Cube}\mathrm{of}7={7}^{3}=7\times 7\times 7=343$

(ii) $\mathrm{Cube}\mathrm{of}12={12}^{3}=12\times 12\times 12=1728$

(iii) $\mathrm{Cube}\mathrm{of}16={16}^{3}=16\times 16\times 16=4096$

(iv) $\mathrm{Cube}\mathrm{of}21={21}^{3}=21\times 21\times 21=9261$

(v) $\mathrm{Cube}\mathrm{of}40={40}^{3}=40\times 40\times 40=64000$

(v…

To view the solution to this question please