Write the Word or Phrase That Best Completes Each Statement $m = - 0.05 x ^ { 2 } + 3.5 x - 49$

Write the word or phrase that best completes each statement or answers the question.
Provide the missing information.
-The gas mileage for a certain vehicle can be approximated by $m = - 0.05 x ^ { 2 } + 3.5 x - 49$ , where $x$ is the speed of the vehicle in mph. Determine the speed(s) at which the car gets $9 \mathrm { mpg }$ . Round to the nearest $m p h$ .

A) $23 \mathrm { mph }$ and $47 \mathrm { mph }$
B) $19 \mathrm { mph }$ and $51 \mathrm { mph }$
C) $27 \mathrm { mph }$ and $43 \mathrm { mph }$
D) $35 \mathrm { mph }$