If -4 < x < 7 and -7 < y < 3, which of the following specifies all the possible values of xy?  Answers:
A) -42 < xy < 21 B) -42 < xy < 24 C) -49 < xy < 28 D) -24 < xy < 21 E) -24 < xy < 24
The least value of xy is a bit more than 7*(-7)=-49 and the largest value of xy is a bit less than (-4)*(-7)= 
<gadget id="calculator">(-4)*(-7)</gadget>
<output>28</output>
28.   Therefore -49 &lt; xy &lt; 28.   Answer: -49 &lt; xy &lt; 28.
<result>C</result>
If -4 < x < 7 and -7 < y < 3, which of the following specifies all the possible values of xy?