<p>pg 599 # 18</p>

<p>In the figure above, ABCD is a rectangle. Points A and C lie on the graph of y= px^3, where p is a constant. If the area of ABCD is 4, what is the value of p. </p>

<p>For those of you who don't have a book to reference. The points are as follow-</p>

<p>A (-1/2, -2)

B (-1/2, 2)

C (1/2,2)

D (1/2,-2)</p>

<p>Thanks!</p>