Nothing! We use bicycles instead!!!

22/7

(x-y)^2=81
x^2+ y^2 -2xy=81
2xy=x^2 + y^2 -81
xy=99-81 /2
xy =8/2
xy=4 is the answer...

Nothing! We use bicycles instead!!!

22/7

(x-y)^2=81
x^2+ y^2 -2xy=81
2xy=x^2 + y^2 -81
xy=99-81 /2
xy =8/2
xy=4 is the answer...