Explanation for Question 20 From the Math (Calc) Section on the Official Sat Practice Test 9
Question 20 asks us, which of the following could be the graph of the 2 number of calories from fat and crunchy green cereal as a function of the 3 number of three-fourths cup, servings of the cereal. 4 Okay. So you could look back at this passage that it gives us right 5 here. That talks about how the serving size has 50 6 calories from fat, but you can also just logically pick the answer to this 7 one. So we're plotting the number of three fourths cup servings by 8 the calories. And logically speaking, 9 we know that if you eat more food, you're going to get more caloric 10 intake from it. So see, 11 doesn't make sense. We can immediately cross that off. 12 You're not having decreasing calories as you're eating more food, 13 the same reason you can get rid of D as the number of cup 14 servings increases, you should again, 15 have more calories. So we're left between a and B and we can 16 pick a as our correct answer choice because we want to pay attention to 17 the Y intercept the y-intercept for a zero zero, 18 which makes sense. Thinking about this logically, 19 if you've eaten no cups of food, 20 you have not adjusted any calories. Whereas graph B suggests that at zero 21 cups, even when there's no food present, 22 there's somehow still calories from fat. And that doesn't logically make sense. 23 So that's why we pick answer choices.