Question

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Answer 1

Step-by-step explanation:

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Answer 2

Answer:

The 3rd side is 7p +4q +10r

Step-by-step explanation:

Let the sides of the triangle are L1, L2 & L3 and its perimeter be P

Given : L1 = 5p + 3q - 4r, L2 = 6p + 5q + 7r,

P = 18p + 12q + 13r

We know that perimeter of a triangle is given by :

P = L1 + L2 + L3

18p + 12q + 13r = (5p + 3q - 4r) + (6p + 5q + 7r) + L3

L3 = 7p +4q +10r