For positive integers s and t, which of the following can be written as t^2? Options.
A) s^2+9  B) s^2+2  C) s^2+3  D) s^2-1  E) s^2-9
Plug values: if s=4, then 4^2+9=25   The question asks which of the following CAN be written as t^2. If s=4, then s^2+9 CAN be written as 5^2.   s^2+9nswer: s^2+9
<result>A</result>
For positive integers s and t, which of the following can be written as t^2?