Unit 0 Answer Key

PR-4 a) ^- = ^-3.8 b) 13» 13.67 c) ^-6 d) ^-3» ^-3.33

PR-5 a) 2x + 27 b) 12x² + 11y c) ^-5xy + 33x

PR-6 a) Double the number and add 1 or y = 2x + 1.

b) Divide by two and subtract 1 or y = x ^- 1

c) Multiply by negative three and add 5 or y = ^-3x + 5

PR-7 ; no

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PR-10 ^- 1 = Area

PR-12 = Area

PR-14 A = i + ^- 1

PR-15 a) 2x² + 5x ^- 3

b) 6x^{2 -} 12x

PR-16 Day 4

PR-17 5b + 4 = 124, b = 24 cm

PR-18 a) 3 b) 2 c) 4

PR-19

PR-21

PR-22 Quadrant 1. Went north, west and then northeast.

PR-23 a) square b) 81

PR-24 a) 9x + 7 b) 3x + 15 c) same d) 2x^{2 -} 20x

e) 2x^{2 -} 7x ^- 15 f) 3x^{2 -} 5x + 8

PR-25 a) ^-4.75 b) ^-94 c) » 1.14 d) 22

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PR-27 a) » 7.86 years, so about 8 years

b) » 1652 students for 7.86 yrs., so 1660 students is good.

PR-28 getting tails: one in two chances versus one in six chances.

PR-29 a) 3or 3.75 b) 3 c) 0 d) 3 e) » 372.25 f) ^-3.4

PR-30 a) b)

PR-31 624 girls, 728 boys

PR-32 ^-4.2, ^-4, , , , 3(5²), (3×5)²

PR-33 b PR-34 a) 40 b) ^-6 c) 7 d) 59