Is the expression 125x^3 + 216 a sum of cubes?

Can someone me with my hwplz(only the circled ones)

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?