Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 6 - Section 6.7 - Formulas - Exercises - Page 256: 30

Answer

$R_4=R_T-R_1-R_2-R_3$

Work Step by Step

To solve the given equation for $R_4$, we keep $ R_4$ and move out all other terms to the other side as follows: $$ R_T=R_1+R_2+R_3+R_4\Longrightarrow R_T-R_1-R_2-R_3=R_4\\\ \Longrightarrow R_4=R_T-R_1-R_2-R_3 .$$
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