#### Answer

a. 30
b. 60
c. 13

#### Work Step by Step

a.
$C=10h+20$
$h=1$
$C=10(1)+20$
$C=10+20$
$C=30$
b.
$C=10h+20$
$h=4$
$C=10(4)+20$
$C=40+20$
$C=60$
c.
$C=10h+20$
$C=150$
$150=10h+20$
$130=10h$
$h=13$

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

a. 30
b. 60
c. 13

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