document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1143295>Question 1143295</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The annual​ profit, P, from selling x subscriptions to a newspaper is given by the equation <BR>\n" );
document.write( "Upper P equals 57 plus 40 x minus 0.01 x squared<BR>\n" );
document.write( "P=57+40x−0.01x2.\r<BR>\n" );
document.write( "\n" );
document.write( "​(a) What is the annual profit from selling 40 subscriptions of this​ newspaper?\r<BR>\n" );
document.write( "\n" );
document.write( "​(b) Approximately how many subscriptions would have to be sold if the publisher wants annual profit of ​$19,000​? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #764094 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=764094\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "(a) Evaluate the given expression at x=40.  You can do that with pencil and paper (or perhaps mentally); or you can use a graphing calculator: graph the function and evaluate it at x=40.<br><BR>\n" );
document.write( "(b) Set the given expression equal to 19000 and solve for x.  That will be very ugly with pencil and paper; it's very simple using a graphing calculator: graph the given function and the constant function 19000 and find the point of intersection.<br><BR>\n" );
document.write( "Note the x value will not be an integer; you will have to round up to make sure the profit is at least $19000.<br><BR>\n" );
document.write( "Since you pretty much have to use a graphing calculator to answer the second question, you might as well use it for both parts. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );