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3 years ago

Please Help Me!!! :)

Mathematics

1 answer:

gulaghasi [49]3 years ago

4 0

Answer:

C) 2

Step-by-step explanation:

Sum means to add up.

It means addition.

The opposite of a number is the inverse of the operational sign it has

It is the additive inverse of that same number.

The opposite of 12 is -12

The additive inverse of 12 is -12.

Therefore, the sum of 14 and the opposite of 12 is expressed thus:

14 + (-12)

= 14 - 12

= 2

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4 years ago

Harmonic mean if a number h such that (h-a)/(b-h)=a/b Prove h is H(a,b) iff satisfies either relation a. (1/a)-(1/h) = (1/h) - (

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A.

$\displaystyle\frac1a-\frac1h=\frac1h-\frac1b$
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b.

$\displaystyle h=\frac{2ab}{a+b}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{\frac{2ab}{a+b}-a}{b-\frac{2ab}{a+b}}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{2ab-a(a+b)}{b(a+b)-2ab}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{ab-a^2}{b^2-ab}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{a(b-a)}{b(b-a)}$
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The other direction can be proved by following the manipulations in the reverse order.

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3 years ago

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IRISSAK [1]

Answer:

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Step-by-step explanation:

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