A painting hung in an art gallery is a square with an area of 9 ft^2. What is the length of one side in inches?A) 3 inchesB) 36 inchesC) 108 inchesD) 12 inches

Area of a square is any side dimension squared since each side is equal. 

x^2 = 9 ft^2  
square root of 9 feet = 3 feet

B) 36 inches