Today in class students practiced multiplying negative numbers.
Answers to HW: 1. a. (-2)⋅(-4.5)=9 b. (-8.7)⋅(-10)=87 c. (-7)⋅(-2)=14 d. (-9)⋅(-10)=90 2. The temperature will be: a. -6∘C, because -3 ⋅ 2 = -6 b. -15∘C, because -3 ⋅ 5 = -15 c. -1.5∘C, because -3 ⋅ 0.5 = -1.5 The temperature was: d. 3∘C, because -3 ⋅ (-1) = 3 e. 9∘C, because -3 ⋅ (-3) = 9 f. 13.5∘C, because -3 ⋅ (-4.5) = 13.5 3. a. -3 b. -13 c. 60 d. 310 e. -112 4. a. 9 oz red, 6 oz gray, and 5 oz brown. The given amounts of dye make 212 oz so each quantity needs to be multiplied by 8 to get 20 oz. b. 45 oz red, 30 oz gray, and 25 oz brown. 100 oz is 5 batches of 20 oz. 5. a. Yes, it could be proportional. The constant of proportionality is 6 wheels per bus. b. No, it would not be proportional because the train cars have a different number of wheels. 6. There were 8 cookies left. Noah made (1.25)(64) = 80 cookies. (0.90)(80) = 72 cookies sold. 80 - 72 = 8
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