Explanation for Question 1 From the Math (Calc) Section on the 2019 October Sat
Not for question number one, we've been given a graph of the Chen families, 2 water usage over 40 weeks. And we're asked during which of the following periods 3 was the water usage above 750 gallons per week. 4 So we see that water usage is on the Y axis and we can 5 find seven 50 right here. 6 Right? So what we want to do is find the period in weeks where 7 we were greater than 750, 8 we zoom in on the graph. We can see that we were above the 9 750 line in this region, 10 right around weeks, 22, 11 maybe to 26. 12 So we just want to find the weeks that are closest to 22 through 13 26, and that's going to be answered twice. 14 See if we were to take all these other weeks and look at the 15 graph, we would see that they would all be below the 750 mark. 16 And so our best answer is going to be C.