B is the correct answer. hope this helped:)
Pretty sure the answer is 247,000
Domain means which values the function can have which make it true or Possible to solve
So all you got to do is set the denominator = to 0 and solve for x
You will get x=7
4/(7-7) is not possible
So x cannot equal to 7 because you cant divide a number by 0!
He'd have to sell 268 items
268x $1.50 = 402
$402 + $54 = $456