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The way your equation is written:   11 plus 4 = 15     times  -7 =  - 105   minus 2 =  - 107

4^2 = 16  added to 11 = 27   times 7 = 189

log (10) = 1

Add both equations together results in :   25 y = 0   so y = 0    

Substitute y= 0  into one of the equations results in      x= 8

Using the decimal digits 0-9

If a digit is used in the first position there are only 9 choices for the second digit....then 8 for the third then 7 for the fourth

so   10 x 9 x 8 x 7 = 5040 

   as opposed to 10000 if you can use a digit more than once.

This is 5!/(0!(5-0)!) → 5!/(1*5!) → 5!/5! → 1

The TWO ends =  TWO x pi r^2  =   2 * pi * 5^2 = 50 pi

The outside   =   pi * d * h =  pi *10 *15 = 150 pi

Total surface area   (add them up)     150 pi + 50 pi = 200 pi = 628.32 sq in

4x+5y=6

4x=6-5y

x=(6-5y)/4

Substitute this 'x' into the SECOND equation

6 (6-5y)/4 - 7y = -20

(36-30y)/4 - 7y = -20

36-30y -28y = -80

-58y = -116

y = 2

x=(6-5y)/4 = (6-10)/4 = -1        

Solve the following system:
{4 x+5 y = 6 |     (equation 1)
6 x-7 y = -20 |     (equation 2)
Swap equation 1 with equation 2:
{6 x-7 y = -20 |     (equation 1)
4 x+5 y = 6 |     (equation 2)
Subtract 2/3 × (equation 1) from equation 2:
{6 x-7 y = -20 |     (equation 1)
0 x+(29 y)/3 = 58/3 |     (equation 2)
Multiply equation 2 by 3/29:
{6 x-7 y = -20 |     (equation 1)
0 x+y = 2 |     (equation 2)
Add 7 × (equation 2) to equation 1:
{6 x+0 y = -6 |     (equation 1)
0 x+y = 2 |     (equation 2)
Divide equation 1 by 6:
{x+0 y = -1 |     (equation 1)
0 x+y = 2 |     (equation 2)
Collect results:
Answer: |  x = -1               and                y = 2

You are describing this:

2(6+2x) =(x)(-6) + 2      Solve for 'x'    =  -1

-1 +- .866 i

QUADRATICS are parabolas.

Generally the equation will look ike  y = ax^2 + bx + c     OR  y= a(x-h)^2 + k

Sorry maybe i should have said incest instead of interbreeding. For example if a dad had s*x with his daughter and that resulted in a child then that would affect the calculation in terms of generations. Also I'm sorry I'm not fimilar with advanced math, is the last line in your answer the final answer to the question? You lost me a bit lol

If you have an equation for a line in the form of   y=mx + b    'b' is the intercept

OR:
Where the y-axis intercept occurs is where x=0       You can just set x=0 and solve the equation to get the intercept of the y axis.

Melody is correct.

The Guest's answer is incorrect when he/she states that  f(x ) /(x - 2)  =  P + 17  (where 'P' is the quotient and 17 is the remainder); the correct expression should be:  f(x) / (x - 2)  =  P + 17 / (x - 2).

As an arithmetical example, let's say that you divide 30 by 13. This results in a quotient of 2 (which above is called 'P') and a remainder of 4, but, it is incorrect to say that 30/13  =  2 + 4; you need to say that 30/13 = 2 + 4/13.

Sorry ...missed that point....was looking at original post and suqsequent post at the same time and saw .308.......

Thanx !

It's only the 08 that is repeated, not the 3.

Let x = 0.308080808.....

10x = 3.08080808....

1000x = 308.080808.....

1000x - 10x = 308.080808... - 3.080808...

990x = 305

x = 305/990 = 61/198

308/999 then

No,

the notation means 0.308080808080808080808080808........ (It doesn't end)