document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=428185>Question 428185</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. If s is directly proportional to t, and s = 40 when t = 15, find t when s =<BR>\n" );
document.write( "64.\r<BR>\n" );
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document.write( " t = 0.025 t = 24<BR>\n" );
document.write( " t = 170.67 t = 40<BR>\n" );
document.write( "2. If a varies directly as b, and a = 75 when b = 40, find a when b = 12.<BR>\n" );
document.write( " a = 6.4 a = 0.4<BR>\n" );
document.write( " a = 22.5 a = 2.25<BR>\n" );
document.write( "3. If y is directly proportional to the square root of x, and y = 25 when x = 3,<BR>\n" );
document.write( "find x when y = 100.\r<BR>\n" );
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document.write( " x = 3Ö 3 x = 48<BR>\n" );
document.write( " x = 100 x = 12<BR>\n" );
document.write( "4. If w varies directly as 2x - 1, and w = 9 when x = 2, find x when w = 15.<BR>\n" );
document.write( " x = 2 x = 36<BR>\n" );
document.write( " x = 5 x = 3<BR>\n" );
document.write( "5. If a, b, and c are positive, and a divided by b is equal to b divided by c,<BR>\n" );
document.write( "then b is called the mean proportion, or geometric mean, between a and c. Find<BR>\n" );
document.write( "the mean proportion between the pair of numbers: 3 and 27.\r<BR>\n" );
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document.write( " b = 9 b = 81<BR>\n" );
document.write( " b = 27 b = 18<BR>\n" );
document.write( "6. If a, b, and c are positive, and a divided by b is equal to b divided by c,<BR>\n" );
document.write( "then b is called the mean proportion, or geometric mean, between a and c. Find<BR>\n" );
document.write( "the mean proportion between the pair of numbers: 5 and 15.\r<BR>\n" );
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document.write( " 5Ö 3 b = 3<BR>\n" );
document.write( " b = 75 3Ö 5<BR>\n" );
document.write( "7. The acceleration of an object varies directly as the force acting on it. If a<BR>\n" );
document.write( "force of 240 newtons causes an acceleration of 150 m/s², what force will cause<BR>\n" );
document.write( "an acceleration of 100 m/s2?\r<BR>\n" );
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document.write( " 160 newtons 16 newtons<BR>\n" );
document.write( " 62.5 newtons 62 newtons<BR>\n" );
document.write( "8. At the grocery mart, a 575g can of green beans cost $0.39. How much will an<BR>\n" );
document.write( "810 g can of green beans cost?\r<BR>\n" );
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document.write( " $0.52 $0.50<BR>\n" );
document.write( " $0.55 $0.53<BR>\n" );
document.write( "9. A public opinion poll found that out of a sample of 450 voters, 252 favored a<BR>\n" );
document.write( "school bond issue. If 20,000 people voted, how many are likely to vote for the<BR>\n" );
document.write( "bond measure?\r<BR>\n" );
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document.write( " 15,714 11,200<BR>\n" );
document.write( " 1,120 10,100<BR>\n" );
document.write( "10. The speed of an object falling from rest in a vacuum is directly<BR>\n" );
document.write( "proportional to the time it has fallen. After an object has fallen for 1.5<BR>\n" );
document.write( "seconds, its speed is 14.7 m/s. What is the speed after it has fallen 5 seconds?\r<BR>\n" );
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document.write( " 20 m/s 51 m/s<BR>\n" );
document.write( " 49 m/s 50 m/s<BR>\n" );
document.write( "11. Newton's law of cooling states that the rate at which an object cools varies<BR>\n" );
document.write( "directly as the difference between its temperature and the temperature of the<BR>\n" );
document.write( "surrounding air. At the moment a steel plate at 270 degrees Celsius is placed in<BR>\n" );
document.write( "air that is at 20 degrees Celsius, its rate of cooling is 50 degrees Celsius per<BR>\n" );
document.write( "minute. How fast is it cooling when the plate temperature is 100 degrees<BR>\n" );
document.write( "Celsius?\r<BR>\n" );
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document.write( " 24 degrees C/min 16 degrees C/min<BR>\n" );
document.write( " 14 degrees C/min 20 degrees C/min </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #297698 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=297698\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> One question per post, please. </SPAN>\n" );
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