Page 635 - Basic College Mathematics with Early Integers

612 C HAPTE R 8 I INTRODUCTION TO ALGEBRA

69. Bamboo and Pacific Kelp, a kind of seaweed, are 70. In an election between the incumbent and a chal-
two fast-growing plants. Bamboo grows twice as lenger, the incumbent received 11,206 more votes
fast as kelp. If in one day both can grow a total of than the challenger. If a total of 18,298 votes were
54 inches, find how many inches each plant can cast, find the number of votes for each candidate.
grow in one day.

Bamboo Kelp

Mixed Review

Evaluate each expression when x = 4, y =-3, and z = 5.

z y
71. 18 - 19 - 5x2 72. +
100 10

Simplify.

73. 9x - 20x 74. -517x2

75. 12x + 512x - 32 - 4 76. -71x + 62 - 21x - 52

Write each phrase as an algebraic expression. Use x to represent “a number.”

77. Seventeen less than a number 78. Three times the sum of a number and five

Write each sentence as an equation using x to represent “a number.”
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79. The difference of a number and 3 is the quotient of 80. The product of a number and 6 is equal to the sum of
the number and 4. the number and 2.

81. Is 3 a solution of 4y + 2 - 6y = 5 + 7? 82. Is 7 a solution of 41z - 82 + 12 = 8?