Can someone help me please to understand this, to answer correctly and explain it so that I can understand it. Thank you.

This is Calculus 1.

Use differentials to estimate the amount of paint needed to apply a coat of paint 0.03cm thick to a hemispherical dome with a radius of 20 cm . The volume of a hemisphere is given by V = = mrs. You do not need to consider the flat part of the hemisphere. Note: painting an object adds to its volume that is why we use the volume formula rather than the surface area formula. Round answer to 3 decimal places. Do NOT include the units (The units are cm3)