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3 years ago

7

Another question: r = ab/a+b Find a....

2 answers:

AnnyKZ [126]3 years ago

8 0

I think the answer is br/b-r = a

MArishka [77]3 years ago

4 0

Keep in mind, because they didn't give us any values we can only find what a equals in terms of the other variables. You'll see what I mean after we get to the final answer.

r = (ab)/(a+b)

Multiply both sides by (a+b)

r(a+b) = (ab)

Divide by r on both sides.

(a+b) = (ab)/r

Subtract b on both sides.

a = ((ab)/r) - b

You can't simplify it any further to my knowledge. Well, besides getting a common denominator with b and subtracting them, but it won't really simplify things.

Now. Let's get a better answer... haha. Here we go:

r = (ab)/(a+b)

Same step. Multiply on both sides.

r(a+b) = (ab)

This time distribute the r to all values.

ar + br = (ab)

Subtract ar on both sides.

ar + br - ar = ab - ar

br = ab - ar

Next step! Factor "a" out of ab - ar by making it a quantity time "a" with "a" removed...
it's easier to show than to explain. So here you go:

br = a(b - r)

Divide (b - r) on both sides.

(br)/(b-r) = a

Hope that helped some! :p

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4 years ago

Evaluate the expression. 1/2 x (4+8)

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Hey there!

1/2 x (4+8)

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6

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3 years ago

Read 2 more answers

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Rainbow [258]

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2 years ago

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3 years ago

Alecsey [184]

Answer:

The answer to your question is letter B

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Process

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