Which of the following describes all values of x for which 9–x^2 >= 0? Select the correct option
A) x >= 1
B) x <= –1
C) -3 <= x <= 3
D) x <= –1 or x >= 1
E) –1 <= x <= 1
9 - x^2 &gt;=0   means x^2 - 9 &lt;=0   =&gt; (x-3)(x+3) &lt;= 0   =&gt; -3 &lt;= x &lt;= 3   Answer - -3 &lt;= x &lt;= 3
<result>C</result>
Which of the following describes all values of x for which 9–x^2 >= 0?