Answer: 13.722 km ; or, write as: 13 13/18 km . ___________________________________________________ Explanation: ___________________________________________________ Area = Length * width ; ___________________________________________________ or, write as: A = L * w ; ________________________
Given: A = 247 km² ;
L = 18 km ;
w = "y" ; ________________________ Find: "y" ______________________________ A = L * w ; ______________________________ Plug in our values: ______________________________ 247 km² = 18 km * "y" ; solve for "y" (in units of "km") ;
_____________________________ 18 y = 247 ; ___________________________________________________________ Divide each side of the equation by "18"; to isolate "y" on one side of the equation; and to solve for "y" : ___________________________________________________________ 18 y / 18 = 247 / 18 ; _____________________________________________ to get: _____________________________________________ y = 13.7222222222222222...... km ; round to: 13.722 km
or; y = 13 13/18 km . _______________________________________________
It was 11 hours because if the temperature drops 2 degrees after every hour, after 11 hours, the temperature would have dropped 22 degrees and 62 - 22 = 40.
