Answer:
C
Step-by-step explanation:
They can't form a triangle because the sum of 2 sidelengths is ALWAYS greater than the 3rd side in a triangle. Because 5+7=12<14, this means that it can't form a triangle.
21 - (3 x 4)
3 x 4 is 12, so it becomes 21 - 12.
21 - 12 = 9
Answer: where are the options?
Step-by-step explanation: