response.$)$

$($Write an equation for the inner trace at $z=7$ using $x$ and $y.)$

$($Write an equation for the outer trace at $z=7$ using $x$ and $y.)$

$($Write an equation for the inner trace at $y=0$ using $x$ and $z.)$

$($Write an equation for the outer trace at $y=0$ using $x$ and $z.)$

$($Write an equation for the inner trace at $x=0$ using $y$ and $z.)$

$($Write an equation for the outer trace at $x=0$ using $y$ and $z.)$

$($Write an equation for where the two surfaces meet using z$.)$