Answer:
PR = 29
Step-by-step explanation:
Given the triangle is isosceles with
PQ = RQ , that is
3x + 10 = 5x - 12 ( subtract 5x from both sides )
- 2x + 10 = - 12 ( subtract 10 from both sides )
- 2x = - 22 ( divide both sides by - 2 )
x = 11
Then
PR = 2x + 7 = 2(11) + 7 = 22 + 7 = 29
