Answered

Sumali sa IDNStudy.com at makuha ang mabilis at kaugnay na mga sagot. Hanapin ang mga solusyong kailangan mo nang mabilis at madali sa tulong ng aming mga eksperto.

The area of the concrete pathway is 350m^2 and it's perimeter is 90m. What is the length of the pathway?

Sagot :

let l  =  length of pathway
& w = width of of pathway
then 2x + 2y = 90  >  2(x+y) =90    >  x+y = 45    >  perimeter of rectangle
                                                              x =  45-y
and     xy    =  350    >      area of rectangle
         ( 45-y)(y) =  350
           45y-y² -350 = 0            /  . -1
           y² - 45y +350 = 0
       ( y -10)(y-35) = 0
         y = 10    or y =  35
so the length is 35m  &
  the width is 10m