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5/8 of 64 km = 40 km
The simplified expression is 40 - 12s
There are 50 8s in 400
There are 70 8s in 560
384s2 - 150 = 6*(64s2 - 25) The term inside the brackets is a difference of two squares, so 6*(8s - 5)*(8s + 5)