D. You multiply all measurements together. The thickness has nothing to do with how much air will be inside. (: hope this helped ya :)
What do you need to solve for?
X=r-4/7-s
S=-r/x+4/x+7
R=-sx+7x+4
I hope this is the right answer and if it's not then my apologies.
And sorry it took so long.
Answer:
1364
Step-by-step explanation:
use the calculator