is 10*abs(d-3) or 10*|d-3| where abs is the absolute difference between d and 3 ie it is always the positive value.
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It would be: 3(7-d) as an algebraic expression
i think it might be 21.
If: df+10f = 3 Then: f(d+10) = 3 And: d = 3/f -10
d / t = s30 / 3 = 10 mphd = distancet = times = speed
5.6=5.60 So it is like 5 60/100. Simplify it to 5 6/10 because 10 times 6=60 and 10 times 10=100. Simplify it again to 5 3/5. So it is 5 and 3/5. ;) :D