2.80=70/i

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Solution for 2.80=70/i equation: 


D( i )

i = 0

i = 0

i = 0

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

2.8 = 70/i // - 70/i

2.8-(70/i) = 0

2.8-70*i^-1 = 0

-70*i^-1 = -2.8 // : -70

i^-1 = 0.04

-1 < 0

1/(i^1) = 0.04 // * i^1

1 = 0.04*i^1 // : 0.04

25 = i^1

i = 25

i = 25

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