All you do is combine the elements that sets D and E have in common. in this case, the only two values in the set will be 8 & 11, because those are the only two numbers that can be found in both set D and set E!!
Answer: !. They had 20 of them
Step-by-step explanation:

343: 49 × 7 = 7^2 × 7 = 7^3
125: 25 × 5 = 5^2 × 5 = 5^3
x^12(7x+5)(49x^2 -35x + 25)
x^12(7x+5)(7x-5)^2