ANSWER:
x^21
STEP-BY-STEP EXPLANATION:
The area of a rectangle is given by the following formula:
[tex]A=l\cdot w[/tex]
Therefore, we substitute and calculate the area, just like this:
[tex]\begin{gathered} A=x^{14}\cdot x^7 \\ \\ A=x^{14+7} \\ \\ A=x^{21} \end{gathered}[/tex]
Therefore, the area of the rectangle is equal to x^21
