Question

answer with full method

Answer 1

surface area
$= 154 \: square \: cm$
$4\pi {r}^{2} = 154 \\ {r}^{2} = 154 \times 7 \div (4 \times 22) \\ r = \frac{7}{2} cm$
volume of the sphere

$= \frac{4}{3} \pi {r}^{3} \\ = \frac{4}{3} \times \frac{22}{7} \times \frac{7}{2} \times \frac{7}{2} \times \frac{7}{2} \\ = 11 \times 7 \times 7 \div 3 \\ = \frac{539}{3} cubic \: cm$

Answer 2

Here's ur answer.
Hope it helps!!