[tex]\begin{gathered} \text{Let's calculate how we should pay for just 1 pound, so to do that we have to divide the amount that we already paid and the weight} \\ \frac{7.14}{42}=0.17 \\ \text{if we paid 0.17 for 1 pound, to know how much we should pay for 63 we must multiply 63 by 0.17 } \\ 63\cdot0.17=10.71 \\ So\text{ Ellen will pay 10.71 dollars for her bag} \end{gathered}[/tex]