Bob

]]>For example 1000 - 357 = 643

We simply take each figure in 357 from 9 and the last figure from 10.

If you can clarify then please clear this line so that I can understand this trick.

]]>You are not required to memorize it. You can always look it up if necessary. Also, there are other methods to get roots that are more amenable to computation, these should be used when possible.

]]>Yes, I should have clarified. After you use the specified formula, you get the Rational # in between by: x+d, x+2d, x+3d...x+nd. To give an example, lets say we have to find 3 rational numbers between 2 and 3. Therefore: x=2 y=3 n=3. Thus, d= (3-2)/(3+1)=1/4. So the n numbers are: 2 1/4, 2 2/4 and 2 3/4. This is fairly obvious, I just wanted to give the generalized formula.

Yes I agree with you I also use this formula of rational number and I got the actual answer.

]]>Thank for sharing. Now i can also calculate only in 3 minutes.]]>

If I am remembering it right, the y intercept is the fixed cost. You are correct that is b.

Yes agree, you are exactly correct. Y intercept is the fixed cost.

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