exam Maths Puzzle Numerical Ability

Which of the following numbers is not the square of an integer?
how????????

A) 100
B) 200
C) 400
D) 900

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exam Other Question

What does 350/x+10=5 simplify to? could somebody help, me please?
1)find the center and length of a radius of each circle

a) x^2+y^2+8x-12x+43=0
I tried. and got stuck
(x^2+8x)+(y^2-12y)=-43
(x^2+8x=43)^2 + (y^2-12y+12)^2=-43+43+12
then....