Good. Minutes should be fine if you were not told otherwise.

The slick is a right circular cylinder with a height of 1 mm, not a sphere. The volume of a cylinder of height and radius isb) State the radius of the slick as a function of it's volume

Not sure what to do here? Is this a sphere with a radius of 1mm?

Solve for in terms of .

No. See above.c) State the radius of the slick as a function of time

Again.. Since this slick is 1mm thick, does this make it a sphere?

This function should be the composition of the function from part (b) with that from part (a).

Once you find part (c), this is just substitution.d) What is the radius of the slick after 40 minutes?