Today in class students used negative numbers to indicate positive and negative water flow into an aquarium and calculated rates. Again, we used negative numbers to indicate elevation/depth.
Answers to HW: 1. a. 20 cookies; based on the information one can determine that 1 cup of flour makes 5 cookies, so 4 cups of flour will make 20 cookies. b. 40 centimeters; based on the information one can determine that 4 centimeters of tape will hang up 1 student project, so the teacher would need 40 centimeters of tape to hang 10 student projects. 2. a. 24 b. 28 c. -23 (or equivalent) d. -118 (or equivalent) 3. a. -2.55 miles; -3.4⋅0.75=-2.55 b. -5 miles per hour; -1.5÷0.3=-5 c. You had to choose one direction to be positive and the other to be negative. Positive distances could mean distances in one direction and negative distances mean distances in the other direction. Positive velocities could mean it was moving in the positive direction and negative velocities mean it was moving in the negative direction. 4. Your answers should be like maybe... a. Water leaking out of a tank b. An airplane descending c. Gravel being emptied out of a truck 5. a. i. -280 m; -340 + 60 = -280 ii. -220 m; -340 + 120 = -220 iii. -100m; -340 + 240 = -100 b. 6 stages of change. 340 ÷ 60 = 5.7 so the submarine would need 6 stages 6. a. not proportional b. proportional - the constant of proportionality is 0.8 sale dollars per original dollar 7. B, C, E
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