Respuesta :

If we plug in d = 0 (to indicate no desserts are ordered), then we'll get

t = 1.4*d + 9.1
t = 1.4*0 + 9.1
t = 9.1

indicating that, on average, the server expects to get $9.10 in tips if no desserts are ordered

This is why the answer is choice D) 

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