4x²+2x-115.162049=0
That's it !
So x≈0.701838730514401 (this isn't the exact value, the number being irrationnal)
It's 5*500,000/100=$25,000
Example: It took me 3 hours to run 15 km: so my average velocity (v) is equal to: $$v=\frac {15}{3}=5$$
So my average velocity is equal to 5 km/h
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42x+1=8
42x=7
2x=log4(7)
x=$$\frac{\log_4(7)}{2}$$
velocity=distance/time
You have to convert 100 yards into km, 52 s into hours, then use this formula.
+870 
