Which of the following sets of numbers could not represent the three sides of a triangle? \{10,17,27\}{10,17,27}
\{9,22,30\}{9,22,30}
\{6,16,19\}{6,16,19}
\{4,7,9\}{4,7,9}

(b)(19,16,20).

Explanation:

The sum of the lengths of any two sides of a triangle must be greater than the third side. (a)(8,11,19)⇒8+11

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.