The expression for the speed of blood through an artery of radius r at a distance c from the artery wall is given by . Factor and simplify this expression. 
Definitions:
Volcanic Ash
Fine particles of pulverized rock ejected from a volcano during an eruption, can cause damage to aircraft and affect climate.
Welded Igneous Texture
Characteristic of volcanic rock that forms when hot volcanic ash and debris fuse together under high temperature and pressure.
Magma
Molten rock beneath the Earth's surface, which can cool and solidify to form igneous rocks.
Pyroclastic Eruption
A volcanic eruption where hot fragments and magma are thrown into the air; also refers to a deposit or rock produced by such an event.
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