Answer:
[tex]14.7 gallons[/tex]
Step-by-step explanation:
To find out how many gallons Haley will need to travel 250 miles, we apply a simple three rule.
[tex]17 miles\longrightarrow 1 gallon\\ 250 miles\longrightarrow x\\ x=\frac{(250 miles)(1gallon)}{17miles}= 14.7 gallons[/tex]