Answer
a.) $\{ x \mid a \lt x \lt b\}$
b.) $(a,b)$
Work Step by Step
a.) The line { x $\mid$ 2 $\lt$ x $\lt$ 7} states that x can be any variable that is greater than the whole number 2, but less than the whole number 7.
$\{x|a
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 1 - Section 1.1 - Real Numbers - 1.1 Exercises - Page 10: 3
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