ElectricPavlov

Wellllll..... round it to two decimal places.....you SHOULD know how to do THAT!!!

Thanx for finding my mistake !

Yah.....I manged to mix weekly and MONTHLY payments ....here is my corrected:

Present value of ordinary annuity

PV = C * ( 1-(1+i)^-n ) /i         i = .0279 / 52      n = 8 yr * 52 wks = 416       PV = 28250       find 'C'

C = payments = $ 75.787

Total payments = 416 * 75.787 =  $ 31527.43         interest =   31527.4 - 28250 = $ 3277.43

a = 36

(3x+6)²  = 9x^2 + 36x + 36

Happens to me pretty frequently too!   D'Oh! 

Add all of the equations together to get

10a + 10b + 10 c + 10 d  = 20    now divide by 10

a + b + c + d = 2

Salad + drink =

   7     +   2.50     = 9.50          change =   20 - 9.50 = 10.50

 Slight edit ....same answer   ....just changed typo   x - 55   to   x^-55  

Result =   x^-55      = 2^-55   = 1 / (2⁵⁵)   or    1/ 36028797018963968    ( as Straight posted !)

minimum value occurs at   - b / 2a   =- -12/(2*3)  = 2

3 ( 2^2) - 12 ( 2) + k = 1

12         - 24       + k = 1

k = 13

In the Quadratic FORMULA

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

b^2 - 4ac   is called the discriminant     if this is a NEGATIVE value ( <0)   then there will be no real solutions

b^2 - 4ac < 0

m^2 - (4)(3)(21) < 0

m^2 < 4 * 3 * 21

m^2 <  252

m < 15.87     ( since we are only looking for POSITIVE integers)

    then the largest positive integer for m would be   15