Which of the following describes all values of x for which 16–x^2 >= 0? Choose one.
A) x >= 1 B) x <= –1 C) 0 <= x <= 1 D) x <= –1 or x >= 1 E) –4 <= x <= 4
16 - x^2 &gt;=0   means x^2 - 16 &lt;=0   =&gt; (x-4)(x+4) &lt;= 0   =&gt; -4 &lt;= x &lt;= 4   Answer - –4 &lt;= x &lt;= 4
<result>E</result>
Which of the following describes all values of x for which 16–x^2 >= 0?