Answer
(a) 8
(b) 42
Work Step by Step
Using the rules of algebra, we obtain:
(a)
$4a + 4 = 40$
$4a = 40 - 4 = 36$
$a = 36 / 4 = 8$
$a = 8$
(b)
$\frac{a }{6}=7$
$a =6*7=42$
General, Organic, and Biological Chemistry: Structures of Life (5th Edition)
by Timberlake, Karen C.
Published by
Pearson
ISBN 10:
0321967461
ISBN 13:
978-0-32196-746-6
Chapter 1 - Chemistry in Our Lives - 1.4 Key Math Skills for Chemistry - Questions and Problems - Page 18: 1.21
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