Really stuck on Poiseuille's Law and rate of flow word problem?? Calculus/physics, please explain and help?!?

Poiseuille's Law gives the rate of flow,R, of a gas through a cylindrical pipe in terms of the radius of the pipe,r, for a fixed drop in pressure between the two ends of the pipe (a) Find a formula for Poiseuille's Law, given that the rate of flow is proportional to the fourth power of the radius. (Use k... show more Poiseuille's Law gives the rate of flow,R, of a gas through a cylindrical pipe in terms of the radius of the pipe,r, for a fixed drop in pressure between the two ends of the pipe

(a) Find a formula for Poiseuille's Law, given that the rate of flow is proportional to the fourth power of the radius. (Use k for any constant of proportionality you may have in your equation.)

R=_____________________


(b) If R=430 cm3/s in a pipe of radius 2 cm for a certain gas, find a formula for the rate of flow of that gas through a pipe of radius r cm

R=_______________________


(c) What is the rate of flow of the same gas through a pipe with a 5 cm radius?

R=__________________________
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