**(a) **Surface area of a sphere:

$\overline{){\mathbf{A}}{\mathbf{=}}{\mathbf{4}}{\mathbf{\pi}}{{\mathbf{r}}}^{{\mathbf{2}}}}$

Solving for r:

The surface area of a ball is measured to be A = 95 cm^{2}.

(a) Write an equation for the radius of the ball, r, treating it as a sphere, in terms of its surface area.

(b) The mass is measured to be M = 45 g. Calculate its density ρ in g/cm^{3}.

(c) What is the density P_{kg/m}^{3} in kg m^{3}?