College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Are you Ready for College Algebra? - A. Diagnostic Test:: Real Numbers and Exponents: 4

Answer

(a) (-1, 5] (b) (-$\infty$, 3) (c) (4, $\infty$]

Work Step by Step

Looking at problem (a) it shows {$\mathcal{x}$ | -1 $\lt$ $\mathcal{x}$ $\leq$ 5} = (-1, 5] Meaning that -1 is an open interval and 5 is a closed interval. This would include numbers between 0 and 5. The number -1 is not included because it is a closed interval.
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