9/20=7.2/h

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Solution for 9/20=7.2/h equation: 


D( h )

h = 0

h = 0

h = 0

h in (-oo:0) U (0:+oo)

9/20 = 7.2/h // - 7.2/h

9/20-(7.2/h) = 0

9/20-7.2*h^-1 = 0

-7.2*h^-1 = -9/20 // : -7.2

h^-1 = 0.0625

-1 < 0

1/(h^1) = 0.0625 // * h^1

1 = 0.0625*h^1 // : 0.0625

16 = h^1

h = 16

h = 16

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