Answer:
18
Step-by-step explanation:
Distribute the 7 to get 273=14n+21
Subtract 21 to get 14n=252
Divide by 14 to get 18
Answer:
211 cm
Step-by-step explanation:
upper rectangle + lower rectangle (11-8=3) + end triangles
(8x20) + (3x12) + (1/2x3x5 each x2)
160+36+15=211
Answer:
(10, -3)
Step-by-step explanation:

8q² + 4qm + 6q + 3m
4q(2q) + 4q(m) + 3(2q) + 3(m)
4q(2q + m) + 3(2q + m)
(4q + 3)(2q + m)