Poiseuille's Law Says That the Rate at Which Blood Is $R$

Short Answer

Poiseuille's law says that the rate at which blood is flowing through a blood vessel of radius $R$ is proportional to $R^{4}$ . For medical reasons, we want to know how a reduction in the radius of a blood vessel affects the blood flow. If the radius of the blood vessel decreases by $10 \%$ , by what percentage does the blood flow decrease? Round to the nearest whole percent.