For positive integers m and n, which of the following can be written as n^2?  Options
A) m+2  B) m+3  C) m+1  D) m+4  E) m-2
Plug values: if m=8, then m+1=9   The question asks which of the following CAN be written as y^2. If m=8, then m+1 CAN be written as 3^2.   Answer: m+4
<result>D</result>
For positive integers m and n, which of the following can be written as n^2?