Geometry assignment

In triangle PQR points A B C are the midpoints of line PQ line PR and line RQ respectively
1. If BC = 7 then PQ = __
2. If QR = 12 then AB = __
3. If AC = 3x + 5 PR = 4x + 16 then PR = __
4. If AB = 7x – 4 QR = 3x + 14 then QC = __
5. If AB = 15 AC = 19 then QR + PR = __
6. If QA = x + 4PA =2x- 5 then BC = __
7. If QP = 20 QR =18 then BC + AB = __
8 . If QP +PR +RQ = 60 then BC +AC+ AB = __