By defferentiating the about using product rule
vdyu/dx +udvdx
dy/dx 4×^3 +6×^2-4× -4=o
Pythagorean theorem =

Since you only have

and

you change the equation to

Giving you

= 135
You can infer from this problem that for every 100 m that
John was able to run, it takes him 9.93 seconds. To get how much time is needed
for 26 – mile marathon, you need to divide 26 miles by 100 meters. But first,
you need to convert 26 miles to meters first.
1 mile = 1,609.34 meters
26 miles = 41,842.84 meters
41,824.84 meters / 100 meters = 418.43 x 9.93 seconds =
4,155 seconds or 69.25 minutes
Variables represent unknowns. They are often letters (like x) but can also be other symbols like Greek numerics.
Hope this helps!!
What ??? Anwser choices pls