Answer
$A=\frac{a+b}{2}$
Work Step by Step
The average of $n$ numbers is always the sum of the numbers divided by $n$. In this case, $n=2$.
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: 14
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