Question

how to solve this give me full solution how to fine

Answer 1

5×5×5×3×3×3×7×7×7
5×3×7=105
105/10 =10.5

Answer 2

${r}^{3} = (\frac{21}{2} ) {}^{3} \\ r = \frac{21}{2} \\ r = 10.5$