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 5 ¬ 9 2 1 x 2 144 5 ¬ 81 1 x 2 63 5 ¬ 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 2 2 y x 1 1 ) ) } 5 } 1 4 1 2 2 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 5 2 x 1 b , or 2 x 2 y 52 b . The only answer of this form is 2 x 2 y 5 1, so 2 b 5 1 or b 1. 6. B; m / EFG 5 ¬ m / FDE 1 m / FED 9 x 1 7 5 ¬ 5 x 1 5 x 9 x 1 7 5 ¬ 10 x 7 5 ¬ x m / EFG 5 9(7) 1 7 5 70 7. C; n ABD > n CBD , so n CBD is a flip of n ABD over the x -axis. Corresponding points have the same x -coordinate and opposite y -coordinates. 8. A; if we know B w C w > C w E w then n ACB > n DCE by SAS. 9. 3 s 2 (2 s 3 2 7) 5 6 s 5 2 21 s 2 10. Brian’s second statement was the converse of his original statement.
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## This note was uploaded on 12/19/2011 for the course MAC 1140 taught by Professor Dr.zhan during the Fall '10 term at UNF.

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