Answer
$C=3.5x$
Work Step by Step
If one gallon costs $3.50$, then $x$ gallons would cost $3.50\times x$, or $3.5x$ dollars.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.1 - Modeling the Real World with Algebra - P.1 Exercises - Page 6: 15
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