Find the length of the side of the given square if area of the square is 625 square meter units than find the value of x

Pls the last one and it has to be like number 6

The price of a lawn mower is x dollars. the store is having a 75% end of summer clearance sale. which expression can be used to find the clearance price of the mower? a) .25x b) .75x c) x - .25(75) d) x + .25(75)

Lowest fraction using common term 28/35