Answer
(a) $A=x^{2}$
(b) $A=lw$
(c) $A=\pi r^{2}$
Work Step by Step
(a) A square of side $x$: $A=x^{2}$
(b) A rectangle of length $l$ and width $w$: $A=lw$
(c) A circle of radius $r$: $A=\pi r^{2}$
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.9 - Modeling with Equations - P.9 Exercises - Page 70: 3
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