Suppose the mass.....

Suppose that the mass, MU), of an insect (in grams) and the volume, V0) (in cubic centimetres), are known functions of time (in days). The mass is given by MC) = 1 + 2, and the volume by V\") = 3 + 41'. a) Find the density p0) (measured in grams per cubic centimetre), as a function of time. [You just need to state what the function is here.] b) Find the derivative of the density. c) At what times is the density increasing