Pre-Calculus Homework Solutions 1

Pre-Calculus Homework Solutions 1 - 57 B 2 2x x2x 22x2 x x...

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57. B; 2 x 2 x 2 x 2 2 x 2 x x x x x x 2 x 0 Thus, x must be 0. 58. a line 59. part of the coordinate plane above the line y 2 x 1 60. 1 2 4 8 , so 1 2 in. 3 8 in. 61. 1 4 1 4 6 , so 1 4 6 in. 1 4 in. 62. 4 5 1 8 0 , so 4 5 in. 1 6 0 in. 63. 10 mm 1 cm 64. 2.5 cm 25 mm, so 2.5 cm 28 mm 65. 0.025 cm 0.25 mm, so 0.025 cm 25 mm Page 12 Reading Mathematics 1. Points P , Q , and R lie on . Point T is not collinear with P , Q , and R . 2. Planes F , G , and H intersect at line j . 3. The intersection of planes W , X , Y , and Z is point P . 4. Linear Measure and Precision Page 16 Check for Understanding 1. Align the 0 point on the ruler with the leftmost endpoint of the segment. Align the edge of the ruler along the segment. Note where the rightmost endpoint falls on the scale and read the closest eighth of an inch measurement. 2. Sample answers: rectangle, square, equilateral triangle 3. Each inch on the ruler is divided into eighths. Point Q is closer to the 1 6 8 -inch mark. Thus, PQ is about 1 6 8 or 1 3 4 inches long. 4. The long marks on the ruler are centimeters, and the shorter marks are millimeters. There are
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