13. The perimeter of a triangle is 7p²-5p+11 and two of its sides are p2 +2p-1 and 3p2 -p +3. Find the third side of the triangle.

Luigi is the first person to finish a 5k race and is standing 13 feet beyond the finish line. another runner, mario, is still running the race and has approximately 24 feet before he reaches the finish line. what is the distance between mario and luigi? explain through words, numbers or pictures how you found the answer.