What is the additive and multiplicative inverse of 0.4?

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Answer 1 · 2015-02-06T14:36:26

The answers are: $-0.4and2.5$

The inverse of 0.4 in the additive operation is that element ( $a$ ) that added to 0.4 gives 0.

So:

$0.4+a=0rArra=-0.4$

The inverse of 0.4 in the multiplicative operation is that element ( $a$ ) that multiplied to 0.4 gives 1.

So:

$0.4*a=1rArr4/10a=1rArr2/5a=1rArra=5/2=2.5$ .