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D is partly constant and partly varies with V,where V=40,D=150,and when V=54 ,D=192 1.find the formula connecting D and V 2. Hence,find D when V=73

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D = a + bV
now just plug in your values to find a and b, so you can then evaluate D(73)
a+40b = 150
a+54b = 192
...
D = 30+3V
...

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