document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=259736>Question 259736</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The cost of a telephone call using long-distance carrier A is $1.00 for any time up to and including 20 minutes and $0.07 per minute thereafter. The cost using long-distance carrier B is $0.06 per minute for any amount of time. For a call that lasts t minutes, the cost using carrier A is the same as the cost using carrier B. If t is a positive integer greater than 20, what is the value of t? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #191189 by </B><A HREF=/tutors/aboutme.mpl?userid=drk><B>drk(1908)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=drk><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=191189\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> PLAN A:<BR>\n" );
document.write( "If t <= 20, then 1$<BR>\n" );
document.write( "If t> 20, then .07*(x-20)<BR>\n" );
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document.write( "PLAN B<BR>\n" );
document.write( "if t > 0, then .06t<BR>\n" );
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document.write( "To be the same cost we set them equal and get<BR>\n" );
document.write( ".07*(t-20) + 1 = .06t<BR>\n" );
document.write( "using distributive property, we get<BR>\n" );
document.write( ",07t -1.4 + 1 = .06t<BR>\n" );
document.write( "combining like terms, we get<BR>\n" );
document.write( ".07t -.4 = .06t<BR>\n" );
document.write( "subtracting .07t, we get<BR>\n" );
document.write( "-.4 = -.01t<BR>\n" );
document.write( "dividing we get<BR>\n" );
document.write( "t = 40<BR>\n" );
document.write( "So, we have a 40 minute call being the same cost. </SPAN>\n" );
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