. If d varies directly as t, and ifd=4 when t = 9, find d when t=21. – InterviewSolution

1.	. If d varies directly as t, and ifd=4 when t = 9, find d when t=21.
Answer» d is proportional to td = kt4 = k × 9k = 4/9So when t = 21then d = (4×21)/9 = (4×7)/3 = 28/3

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