You should know dummy
Answer:
9^2= 81, √25= 5, 21^2= 441, √4= 2, √144= 12, 16^2= 256, √625= 25, (-11)^2=121
2(3y + 5) = 3 (5y +1/3)
6y+10=15y+1
9=9y
y=1