For Exercises 5 to 8 MNPQ is a parallelogram with diagonals QN and MP 7 8 M Exercises 5 8 5 a If QN 12 8 find QR a If QR 7 3 find RN If QR R If MR and MP N b If MR 5 3 find MP b If MP 10 6 find RP 2x 3 and RN x 7 find QR RN and QN 5 a 7 and MP 12a 34 find MR RP