The height of a chair on a Ferris wheel follows the equation y = 5.7 sin...

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The height of a chair on a Ferris wheel follows the equation y = 5.7 sin 0.31x +11.9, where y is the height (in metres) and x is the time (in seconds). To the nearest tenth, at what time does the height first reach 15m. The height of a chair on a Ferris wheel follows the equation y = 5.7 sin 0.31x +11.9, where y is the height (in metres) and x is the time (in seconds). To the nearest tenth, at what time does the height first reach 15m.