3) Grease is being drained through a conical funnel with a radius of 4 cm and a depth of 8 cm at a rate of 2 cm3/min.
a) How fast is the depth of the grease changing when there is 4 cm left?

there are infinitely many solutions.

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)