Chapter 5 - Section 5.1 - Adding and Subtracting Polynomials - Exercise Set - Page 349: 54

$14x^{3}-4.7x^{2}+5.3$

$ \begin{array}{llll} & 7.9x^{3} & -6.8x^{2} & +3.3\\ + & 6.1x^{3} & -2.2x^{2} & +7\\ + & & 4.3x^{2} & -5\\ \hline & & & \\ = & 14.0x^{3} & +(-9.0+4.3)x^{2} & +10.3-5\\ & & & \\ = & 14x^{3} & -4.7x^{2} & +5.3\\ & & & \\ & & & \end{array}$