document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1189907>Question 1189907</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hi, can someone please help me out with this question?\r<BR>\n" );
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document.write( "https://drive.google.com/file/d/1xs44rvhwHo0ttZc7btuhRwRhorbWTUuG/view?usp=sharing </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #821459 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=821459\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> not sure if they wanted you to do this manually.<BR>\n" );
document.write( "if so, let me know and i'll work on a manually derived solution configuration.\r<BR>\n" );
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document.write( "the easiest way i can see is to use the desmos.com calculator.\r<BR>\n" );
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document.write( "here's a video on how to do that.\r<BR>\n" );
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document.write( "<a  rel=nofollow HREF= \"https://www.youtube.com/watch?v=b75PEalga4c\" target = \"_blank\">https://www.youtube.com/watch?v=b75PEalga4c</a>\r<BR>\n" );
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document.write( "i followed the directions on the video and this is what i got.\r<BR>\n" );
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document.write( "the little hourglass on the left allows you to zoom in on the graph automatically.\r<BR>\n" );
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document.write( "othrwise, use her instructions to set the x and y limits.\r<BR>\n" );
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document.write( "the equation is entered from the keyhboard using the tilde rather than the equal sign.\r<BR>\n" );
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document.write( "here's the link to the desmos.com calculator.\r<BR>\n" );
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document.write( "<a  rel=nofollow HREF= \"https://www.desmos.com/calculator\" target = \"_blank\">https://www.desmos.com/calculator</a>\r<BR>\n" );
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document.write( "your regression eqution of y = a * (b * (x - c)) + d becomes:\r<BR>\n" );
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document.write( "y = 13.8091 * sin(.509283 * (x - 4.11135)) + 13.4074.\r<BR>\n" );
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document.write( "to find the value for next march, just add 12 to 3 to get x = 15 and solve the equation for x = 15.\r<BR>\n" );
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document.write( "the equation becomes y = 13.8091 * sin(.509283 * (15 - 4.11135)) + 13.4074.\r<BR>\n" );
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document.write( "you should get y = 4.1187.\r<BR>\n" );
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document.write( "to find the month when the average tmperature first reaches 17 degrees centigrade, solve the equation for y = 17.\r<BR>\n" );
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document.write( "the equation becomes 17 = 13.8091 * sin(.509283 * (x - 4.11135)) + 13.4074.<BR>\n" );
document.write( "subtract 13.4074 from both sides of the equation to get:<BR>\n" );
document.write( "17 - 13.4074 = 13.8091 * sin(.509283 * (x - 4.11135))<BR>\n" );
document.write( "simpliy to get:<BR>\n" );
document.write( "3.5926 = 13.8091 * sin(.509283 * (x - 4.11135))<BR>\n" );
document.write( "divide both sides of the equation by 13.8091 to get:<BR>\n" );
document.write( "3.5926 / 13.8091 = sin(.509283 * (x - 4.11135))<BR>\n" );
document.write( "simplify to get:<BR>\n" );
document.write( ".2601617774 = sin(.509283 * (x - 4.11135))<BR>\n" );
document.write( "find the arcsin of .260167774 to get:<BR>\n" );
document.write( "arcsin(.260167774) = .263189746<BR>\n" );
document.write( "solve for .509283 * (x - 4.11135)) = .263189746 as follows:<BR>\n" );
document.write( "divide both sides of the equation by .509283 to get:<BR>\n" );
document.write( "x - 4.11135 = .5167848642.<BR>\n" );
document.write( "add 4.11135 to both sides of the equation to get:<BR>\n" );
document.write( "x = 4.628134864.<BR>\n" );
document.write( "that should be some time in april.\r<BR>\n" );
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document.write( "there's an easier way to do this using the desmos.com graph.<BR>\n" );
document.write( "set x = 15 to find next march.<BR>\n" );
document.write( "set y = 17 to find where the graph goes above 17 deegrees.\r<BR>\n" );
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document.write( "it will look like this.\r<BR>\n" );
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document.write( "check out the video.<BR>\n" );
document.write( "it's pretty good.<BR>\n" );
document.write( "let me know if you get hung up trying to do it yourself.\r<BR>\n" );
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document.write( "theo\r<BR>\n" );
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