If set D is a subset of set E, it means that set E includes set D. D ∩ E = D The answer to your question is A. I hope that this is the answer that you were looking for and it has helped you.
Let y = the length of the 3rd side
x+3 + 2x+4 + y = 6x
x + 2x + 3 + 4 + y = 6x
3x + 7 +y = 6x
7 + y = 3x
y = 3x - 7
The length of the third side in terms of x is 3x-7
She is not in credit overload because her total is $2240 so she has an extra 15 dollars left from her salary
2 1/7 + 5/7 = 2 6/7 total bags
2 6/7 - 1 2/7 = 1 4/7 bags
She took 1 4/7 bags home.
