Answer
$-20^oC$
Work Step by Step
Substitute the given value of the $F$ into the expression:
$C=\dfrac {5}{9}\left( F-32\right) =\dfrac {5}{9}\left( -4-32\right) =\dfrac {5\times \left( -36\right) }{9}=5\times \left( -4\right) =-20$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.1 Algebra Essentials - A.1 Assess Your Understanding - Page A11: 82
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