document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1128231>Question 1128231</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A sinusoidal function whose period is 12 , maximum value is 10, and minimum value is  &#8722;4 has a y-intercept of 3.\r<BR>\n" );
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document.write( "What is the equation of the function described?\r<BR>\n" );
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document.write( "f(x)=7cos(4x)+3\r<BR>\n" );
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document.write( "f(x)=7cos(4&#960;x)+3\r<BR>\n" );
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document.write( "f(x)=7sin(4&#960;x)+3\r<BR>\n" );
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document.write( "f(x)=7sin(4x)+3 </SPAN>\n" );
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document.write( "With a maximum of 10 and a minimum of -4, the center line is y=3 and the amplitude is 7.  In all of the answer choices the \"7\" and \"3\" are in the right place.<br><BR>\n" );
document.write( "The period of sin(kx) or cos(kx) is 2pi/k.  With the given answer choices, the period is then either 2pi/4pi = 1/2 or 2pi/4 = pi/2.<BR>\n" );
document.write( "A period of 12 is not possible with the given answer choices.  Apparently the period is supposed to be 1/2 instead of 12.<br><BR>\n" );
document.write( "It would be polite to make sure you have shown your question correctly before posting.....<br><BR>\n" );
document.write( "So assuming the period is supposed to be 1/2, then the answer has to involve either sin((4pi)x) or cos((4pi)x).  Since the y-intercept of 3 is the center line of the function, the function is a sine function.<br><BR>\n" );
document.write( "ANSWER: f(x) = 7sin((4pi)x)+3 </SPAN>\n" );
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