Today in class students worked on multiplying and dividing with negative and positive numbers.
Answers to Lesson 10 HW: 1. a. -4 b. 4 c. -15 d. 15 2. a. -6 b. 6 c. -6 3. a. -6, -2, 0, 4, 8 b. -512, -5.2, -5, -52, 5.5 4. a. -589+589 b. -589+500+89 c. -589+500+90+(-1) 5. a. 255 m b. 172 m Answers to Lesson 11 HW: 1. -4, -50, 0.2 2. a. 815 b. -3 c. 157 d. -10 3. a. Positive b. Negative c. Negative d. Positive 4. a. a=-12 b. b=4 c. c=-1 d. d=-12 5. Blue: 37 1/2 cups, green: 12 1/2 cups, white: 50 cups. There are 4 cups in a quart so 112 quarts is 6 cups. There are 16 cups in a gallon so 12 gallons is 8 cups. So the ratio of cups of blue to cups of green to cups of white is 6 to 2 to 8 or, equivalently, 3 to 1 to 4. 3 + 1 + 4 = 8. 100 ÷ 8 = 12.5 So, the painter needs 37.5 cups of blue because 3 ⋅ (12.5) = 37.5. The painter needs 12.5 cups of green because 1 ⋅ (12.5) = 12.5. And the painter needs 50 cups of white because 4 ⋅ (12.5) = 50.
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