A notebook costs $4 each. The total cost (y) and the number of notebooks (x) are directly proportional because y = 4x. ________, True, False, 2. A car travels at a constant speed of 50 km/h. The distance traveled (y) and the travel time (x) are inversely proportional. ________, True, False, Four workers can finish a job in 15 days. If the number of workers increases to 8, the number of days needed will decrease. ________, True, False, If y = 3x, then when x doubles, y also doubles. ________, True, False, If y = k/x, then y and x are directly proportional quantities. ________, True, False, If y = 24 when x = 6 and y is directly proportional to x, then y = 40 when x = 10. ________, True, False, A printer prints 90 pages in 3 minutes. If the number of pages printed is directly proportional to time, the printer will print 150 pages in 6 minutes. ________, True, False
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