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Pre-Calculus Homework Solutions 117

Pre-Calculus Homework Solutions 117 - 3 B let x represent...

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3. B; let x represent the length of the shadow. Use the Pythagorean Theorem to solve for x to the nearest foot. 12 2 ¬ 9 2 x 2 144 ¬ 81 x 2 63 ¬ x 2 8 ¬ x The shadow is about 8 feet long. 4. D 5. D; the slope of the line in Kris’s graph can be found using points (0, 3) and (4, 11). ( ( y x 2 2 y x 1 1 ) ) 1 4 1 0 3 or 2 The slope of the line in Mitzi’s graph is the same as the slope of the line in Kris’s graph, or 2. So the line in Mitzi’s graph has equation y 2 x b , or 2 x y b . The only answer of this form is 2 x y 1, so b 1 or b 1. 6. B; m EFG ¬ m FDE m FED 9 x 7 ¬ 5 x 5 x 9 x 7 ¬ 10 x 7 ¬ x m EFG 9(7) 7 70 7. C; ABD CBD , so CBD is a flip of ABD over the x -axis. Corresponding points have the same x -coordinate and opposite y -coordinates. 8. A; if we know BC CE then ACB DCE by SAS. 9. 3 s 2 (2 s 3 7) 6 s 5 21 s 2 10. Brian’s second statement was the converse of his original statement. 11. Explore: Creston ( C ) and Dixville ( D ) are endpoints of the base of an isosceles triangle formed by Creston, Dixville, and Milford. We are
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