Answer
The incorrect choice for calculate the number of is option (d) .
i.e
[tex]\frac{0.55}{g} = 17.6[/tex]
Reason
As given
You were billed $17.60 for water usage at a rate of $0.55 per gallon.
The number of gallons of water is represented by g.
Than the equation becomes
0.55 × g = 17.60
[tex]g = \frac{17.60}{0.55}[/tex]
g = 32
Therefore 32gallons of water is used .
Thus Option (d) is incorrect between all the options.