Answer:
Option C Both gift boxes have the same length for a given volume
Step-by-step explanation:
step 1
David's gift box
Calculate the side length of the box for a given volume
we have
[tex]f(x)=\sqrt[3]{x-1}[/tex]
For [tex](x-1)=2\ ft^{3}[/tex] ------> [tex]f(x)=\sqrt[3]{2}=1.26\ ft[/tex]
For [tex](x-1)=4\ ft^{3}[/tex] ------> [tex]f(x)=\sqrt[3]{4}=1.59\ ft[/tex]
For [tex](x-1)=6\ ft^{3}[/tex] ------> [tex]f(x)=\sqrt[3]{6}=1.82\ ft[/tex]
For [tex](x-1)=10\ ft^{3}[/tex] ------> [tex]f(x)=\sqrt[3]{10}=2.15\ ft[/tex]
therefore
Both gift boxes have the same length for a given volume