Answer: All sides are 5cm hope this helps...
Answer:
4990
Step-by-step explanation:
Multiply 638 by 5 then add 1800 and that's your answer
2d+3d-2d+4d= 9d-16
2d is cancelled
3d+4d=9d-16
7d=9d-16
16=9d-7d
16=2
16/2
d=8
