ElectricPavlov

sqrt(16) * sqrt(4) =

     4      *       2    =   8

Caveat  sqrt 16   can be  +4   or  -4

              sqrt 4                 +2       -2        So answer COULD be   -8 also

Circle area = pi * r^2       or   pi * (d/2)^2     where r = radius and d = diameter

I do not know how to solve it mathematically, I hope someone does and we can both learn.

I DO know at very small values , as x approaches zero, sin(x) ~~ x     so the numerator becomes 5x as we approach zero    5x/x = 5     But I do not think that is a very good proof of your question.......

  You can GRAPH  sin(5x) / 5   and see it is true too.....still not a great proof.....

Anyone?

To add or subtract fractions you will need to convert them to forms with common denominator

2/3 = 4/6   and 1/2 = 3/6

4/6 - 3/6  =  (4-3)/6 = 1/6    

This is not a short answer....here is a good tutorial from PurpleMath

http://www.purplemath.com/modules/synthdiv.htm

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8x +6    is the expression.....

when x=5

8(5) + 6 = 46