Can i get some ? i will mark brainliest and 50 points! due tomorrow because grades are coming out tomorrow and this is past due!

solve for x: 2/7x + 1/5x = 51
x=_
write as an integer or reduced fraction

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters