- How to measure dB SPL ?

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Roofs or rollar coasters using k truss design? If R is the region bounded by y=2x and y=16(x)^1/4 then what is the volume of the solid generated when R is revolved about the x-axis? We are told satellites exist that can zoom far enough to see what I'm reading. Where's the proof this tech exists? How much is 1/4 of a cake? What are some names of roofs or rollar coasters using the k truss design.?