If two sides of a triangle have lengths 3 and 7, which of the following could be the perimeter of the triangle?
I. 9
II. 15
III. 19  Pick one:
A) None
B) I only
C) II only
D) II and III only
E) I, II, and III
Let x be the length of the third side.   7-3 &lt; x &lt; 7+3   4 &lt; x &lt; 10   14 &lt; perimeter &lt; 20   The answer is II and III only.
<result>D</result>
If two sides of a triangle have lengths 3 and 7, which of the following could be the perimeter of the triangle?
I. 9
II. 15
III. 19