Has an area of 225 square feet what is the length of each side

The area of the square: A=a2

where "a" is a length of side.

Therefore:                                                    
A=225 ft2 and A=a2 a2=225 a=|225| a=15 (ft)                                    
                                                                        

On monday,mrs.wise bought 3 lbs of apples at $4per lb= 4*3=$12on tuesday ,20%off and she buy 5 lbs of apples = $4-20%=3.20*5lb=$16example: other wise when she buy 5lbs on monday she have to spend 4*5=20

21, i'm pretty sure it's right lol