Answer:
The exact value of cos(45°) is √(2) / 2.
Step-by-step explanation:
The common factors for 20 is 1,5
25 is 1,5
40 is 1,5
GCF:5
(4h+2)(2h+8)
4htines 2h= 8h^2
4htimes8=32h
2 times 2h=4h
2 times 8=16
Add Middle two you have
8h^2+36h+16
Answer:
140 mile
Step-by-step explanation:

While x is the speed of the second train.