If x > 1, which of the following decreases as x decreases?
I. 1/(x + x^2)
II. 2x^2 − x
III. 1/(x + 1)  Pick one
A) I only B) II only C) III only D) I and II only E) II and III only
let x= 4 and 3 b old and new values   ST1: x= 4 -&gt; 4+16 =1/ 20   x=3-&gt; 3+9 = 1/12 ...increased   ST2:x= 4-&gt; 2*16-4 = 28   x=3-&gt;2*9-3 = 15   decreased   St3: x=4-&gt; 1/4 = .25   x=3-&gt;1/3 = .33   Ans: II only
<result>B</result>
If x > 1, which of the following decreases as x decreases?
I. 1/(x + x^2)
II. 2x^2 − x
III. 1/(x + 1)