MATH_REV_PART1_ECO220_SOLN

# MATH_REV_PART1_ECO220_SOLN - 1. (-2 / 3 , ∞ ) 2. [2 , 5)...

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Math Review for ECO220Y: PART 1 of 2–Answers 1 Percentages 1. (a) 3.76 (b) 2.79 2. (a) 25% (b) 75% (c) 36 obs. (d) 1 obs. (e) 22.5 round to 23 obs. (f) 180 obs. (g) round oﬀ to 11 more retired people (h) round oﬀ to 2 more retired people (i) i. 27 obs. ii. 45.4% 2 Equation of a Line 1. y = x (a) graph required (b) y increases by 1 unit (c) y increases by 1 unit (d) y increases by 1 unit (e) Because the slope of a line is constant (f) y decreases by 1 unit (g) 0 2. y = 2 (a) graph required (b) no change 1

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(c) no change (d) 2 3. y = 4 - 2x (a) graph required (b) y decreases by 2 units (c) y decreases by 2 units (d) Because the slope of a line is constant (e) 4 4. (a) graph required (b) graph required (c) y = 12 - x (d) graph required (e) y = 7 - x (f) graph required (g) graph required (h) y = 10 - 2x (i) graph required (j) y = 20 - 2x 3 Inequalities, Intervals, and Absolute Values

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Unformatted text preview: 1. (-2 / 3 , ∞ ) 2. [2 , 5) 3. [2 , 10 / 3] 4. (0 , 1) 5. x = 4 or x = 1 6. (3 , 7) 7. (-∞ ,-2] and [2 / 3 , ∞ ) 2 4 Areas 1. Area = 1 2. Area = 1 3. Area = 1 4. Many possible answers 5. Area = 1 6. Area = 1 7. Area = 1 8. Many possible answers 9. Area = 0.05 10. Area = 0.10 11. Area = 0.05 12. 1.20 13. 1.80 14. 1.5 15. 1.5 16. Area = 0.15 17. Area = 0.05 18. Area = 0.10 19. 2.58 20. -2.58 21. 2.33 22. -2.33 3 5 Summation 1. (a) 796.0 (b) 138.1 (c) 934.1 (d) 381.7 (e) 335.36 (f) 864.9 (g) No. No rule that says they should be equal (h) 3346.25 (i) 6609.69 (j) No. No rule that says they should be equal (k) 13,669 (l) -25.9 (m) 796,000 (n) 69.05 (o) 766.0 (p) 716.4 6 Pi and e 1. True 2. True 3. True 4. True 5. True 6. True 7. True 8. True 4 9. True 10. True 5...
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## This note was uploaded on 04/10/2010 for the course ECO ECO220 taught by Professor Atamazaheri during the Spring '09 term at University of Toronto.

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MATH_REV_PART1_ECO220_SOLN - 1. (-2 / 3 , ∞ ) 2. [2 , 5)...

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