X:{a, b, c}, because the numbers(or letters in this problem) cannot repeat.
Answer:
2x2x2x2x3x7,This is because all of that sum equals the total of
Step-by-step explanation:
2x2x2x2x3x7
Answer:
B. -21a-15
Step-by-step Explanation:

Well just plug those two numbers into the equation: 7(3) - 3(2) Which equals 15 so B) 15