Use a Vertical Format to Add the Polynomials $$\begin{array} { r } 9 x ^ { 4 } + 2 x ^ { 3 } \\6 x ^ { 4 } + 7 x ^ { 3 } \\\hline\end{array}$$

Multiple Choice

Use a vertical format to add the polynomials.
- $$\begin{array} { r } 9 x ^ { 4 } + 2 x ^ { 3 } \\6 x ^ { 4 } + 7 x ^ { 3 } \\\hline\end{array}$$

A) $15 x ^ { 4 } + 9 x ^ { 3 }$
B) $24 x ^ { 7 }$
C) $15 x ^ { 8 } + 9 x ^ { 6 }$
D) $24 \mathrm { x } ^ { 14 }$