Answer:
They sold 38 phone cases.
Step-by-step explanation:
The equation I used to solve is

8,000,000+500,000+40,000+0,000+700+30+8 This is the expanded form of 8,540,738
Volumen carton= 64000 inches³
Volume of a candy box= 6 inx 5 inx 1/2
Volume of a candy box=15 inches³
Then, you have that the total candy boxes in the carton is:
x=640000 inches³/15 inches³
x=4267 candy boxes
About how many candy boxes are in the carton? There are 4267 candy boxes
I need an operation, sweetheart. Are you looking for a sum, difference, what?
3-4z=-5+8z
Add 5 to both sides
8-4z=8z
Add 4z to both sides
8=12z
Divide both sides by 12
z=12/8
Simplify
z=3/2