ElectricPavlov

You sound like you are recruiting for a fraternity ! 

Looking at this diagram, you should be able to answer your question !  

Draw a Venn diagram   ....   I find 4 students palyed no sport....   did you find the same?

Guest,    you should 'check' your answers for 'reasonableness' ...when solving problems...especially on tests !  

perimeter =   L + L + W + W

and you are given  W = 7 + 5L    Sub this into the above for W

L + L + W + W  =  182

L + L + (7+ 5L) + (7+5L)  = 182

12 L + 14 = 182                              Now you can solve for L      then   W = 7 + 5L

to complete the square, the leading coefficient has to be '1'

3x^2  - 5x   + 1 = 0      leading coefficient is '3'     divide the whole equation by 3

  x^2  - 5/3 + 1/3  = 0       now leading coefficient is 1 

                                              now take 1/2 of the MIDDLE coefficient (-5/3      one half is  -5/6)    then square it and add it to BOTH sides of the equation:     x^2 - 5/3   + 1/3    +    25/36   = 25/36    now you can do this:

                    (x- 5/6)^2     + 1/3    =  25/36             ( note how the green 25/36 is 'built in' to the (x-5/6)^2 component)

                                now   subtract   1/3   from both sides to clean it up a bit

                     (x-5/6)^2   =   25/36 - 12/36

                     (x-5/6)^2 = 13/36                           done.    You try the second one.......

Prices    f    

              w = 2f

               r = 2.50 + w = 2.50 + 2f

  Summed, they equal  11.25

        f    +     2f      +     2.5 +2f      =     11.25   

                         solve for 'f' the french bread price, then w = 2f    and  r = 2.5 + 2f

P = I/rt       you are looking for P

                  you are given :      I =20    r = .05  (this is 5%)  and t = 5 years  

                           plug in these values to calculate P   ...............

15 p  + 10 s = 35

19 p + 19  s = 57        Simultaneous equations....2 unknowns    2 equations 

Mutiply eq 1 by    - 1.9

-28.5 p  - 19 s = -66.5    add to second equation

-9.5 p = -9.5

p = 1 second

      then YOU should be able to calculate  how long a sit up takes !  

2.

14 1/7 Shram / 4 5/7 Shrum  99/7   *  7/33 = 99/33   =    3 Shram /1 Shrum         so   1 Shram = 1/3 Shrum

4 5/7 shrum  / 3/7 shrim = 33/7 * 7/3 =  33/3 = 11 shrum/shrim         1 shrim = 11 shrum