#### Answer

a. $C=1000+400(d)$
b. 3000 dollars
c. 6 days

#### Work Step by Step

a. $C=1000+400(d)$
b. $d=5$
$C=1000+400(5)$
$C=1000+2000$
$C=3000$
c. $C=3500$
$3500=1000+400(d)$
$3500-1000=400(d)$
$2500=400(d)$
$2500\div400=d$
$d=6.25$
$d=6$

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

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

a. $C=1000+400(d)$
b. 3000 dollars
c. 6 days

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