Two spherical pieces of cookie dough have radii of 3cm & 5cm. the pieces are combined to form one large spherical piece of dough. what is the approximate radius of the new sphere of dough? round to the nearest tenth

Hello,

The sum of volumes of the two spheres is

4/3*π*a³+4/3*π*b³=4/3*π*c³

c=∛(a³+b³)=∛(3³+5³)=∛152=5.336803297...≈5.34 (cm)

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