510-07_C_Countdown.pdf

# 53 if 3 f x x and 2 6 g x x what is the value of f g

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Copyright MATHCOUNTS, Inc. 2006. All rights reserved. 2007 Chapter Countdown Round 66. A 2 inch by 2 inch square has its area increased by 21 square inches producing a new square. How many inches long is a side of the new square? 67. The radius of a circle is decreased by 10%. By what percent will the area be decreased? 68. What is 3 4 16 8 4 expressed as a positive integer? 69. What is the ratio of the volume of a cube with edge length six inches to the volume of a cube with edge length one foot? Express your answer as a common fraction. 70. Anne donates 4% of her total income each year to charity. If her 2005 donations totaled \$1,308, what was her total 2005 income, in dollars? 71. An exhibit hall in a convention center measures 20 by 30 yards. A square area of 9 square yards must be reserved in one corner for registration. How many square yards will remain for exhibit space? 72. Carla spent two-fifths of her savings on a bracelet and had \$9 left over. How many dollars did Carla’s bracelet cost?
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