Alex bought 2 printer cartridges for $28 each and a printer for $85. He gave the cashier $150. How much change should Alex have
1 answer:
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In Cartesian coordinates, the region (call it ) is the set
In the plane , we have
which is a circle with radius . Then we can better describe the solid by
so that the volume is
While doable, it's easier to compute the volume in cylindrical coordinates.
Then we can describe in cylindrical coordinates by
so that the volume is