ElectricPavlov

Find the radius of the circle.....  then the sqaure has sides = 2 * r     and you can calculate the area

2x^2 = -2y^2 + 12x - 4y + 20

2x^2 - 12x    + 2y^2 + 4y  = 20

x^2 - 6x + y^2 + 2y = 10

(x-3)^2    + (y-1)^2   =  10 + 9 + 1       20 = r^2 of the circle    

Square   2*r  x  2*r =   4 r^2       4(20) = 80  units²  

13/x = x/3

39 = x^2

x = sqrt39

3 miles / 10 m/hr = .3 h   for car    = 18 minutes

3 m / 65 m/hr  x 60 min/hr   + 5 x 3  min    =   17.78 min by train

7/20 x 100% = 35 %

Let x =  .3636....

100x = 36 . 3636

100x - x  = 99x = 36 .

     x = 36/99 = 4/11          4 + 11 = 15

You will have to re-fuel each car  FOUR times

Car A    100 miles / 185 m/hr   = 1945.94 seconds   + 4 x 30 = 2065.95 seconds to finish

Car B     100 miles/ 200 m/hr  =   1800  seconds      + 4 x 90 = 2160 seconds to finish   

      Which car would you like?    

Here is the graph:

Which one of the fractions reduces to '2'   ?????  

That is 2.5 hours   (  2 hours 30 min)

3600 seconds/hr   x 2.5 hr = ........  seconds

3 + 3 + 3

3 + 3 + 1 + 1 + 1

3 + 1 + 1 + 1    + 1 + 1 +1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1