CPhill

Here's a good explanation :  http://www.mathsisfun.com/data/standard-deviation.html

This is just the "formula" for   13C10  =  286

Use this →     given degrees  x   [ pi ] / 180

$3514.65  +   $5674.25  - $1207.03   = $7981.90  profit

z / 2  + 1  ≤  7      subtract 1 from both sides

z / 2  ≤  6    multiply both sides by 2

z ≤  12

 ( √[2⁶] ) ²  =   2⁶ =   64

1/ [2/3] X 5/6   =

3/2 x  5/6  =

15 / 12  =

5 / 4

f(x)= -2/3 * x2 - x  +5, f(6)

This just means that we want to put 6 into the function and evaluate....so we have

(-2/3)(6)^2  - 6 + 5   =   -24 - 6 + 5   =  -30 + 5  = -25

I = Prt      divide both sides by  rt

I / [rt]  = P       "3" is the correct response

Look at he graph, here: https://www.desmos.com/calculator/lgnpwgfwaj

There are two occurences when f(x)  = x

In the third function......f(x)  = x  when x =   3 + 1/3 

And in the fourth function, f(x)  = x when x = 5