Answer
$4.2t^3+3.5t^2-6.4t-1.8$
Work Step by Step
Add the polynomials, then combine like terms to obtain:
$=5.3t^2-6.4t-9.1+4.2t^3-1.8t^2+7.3
\\=4.2t^3+(5.3t^2-1.8t^2)-6.4t+(-9.1+7.3)
\\=4.2t^3+3.5t^2-6.4t-1.8$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 4 - Polynomials - 4.4 Addition and Subtraction of Polynomials - 4.4 Exercise Set - Page 259: 25
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