- Explain why a swimming pool appears shallower than it actually is?

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Audio system produces intensity of 100 dB & another audio system produces intensity of 103dB. Calculate intensity ratio of two audio systems? 30 multiplied by 6475? Help with this question please
physics? Find a. the number of lines of symmetry of the diagram, b. the order of rotational symmetry of the diagram.? Given that x is a normal variable with mean μ = 49 and standard deviation σ = 7.1, find the following probabilities. P(x ≤ 60)?