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OpenStudy (anonymous):
A Ferris wheel of diameter 40 m has its centre 21 m above the ground. The wheel rotates once every 30 seconds. If the function y = a cos b(x - c) + d is used to show a rider's height above the ground, starting at the lowest point, then what is the value of d?
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OpenStudy (anonymous):
is the answer 21?
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