Explanation for Question 4 From the Math (Calc) Section on the 2019 May Sat
So question four asks based on the line of best fit of the following, 2 which is the best estimate of the increase in predicted body length in centimeters 3 for every 10 centimeter centimeter increase in headlines. 4 So let's go back up and see what 5 the answer to this is. So as you can see the excess access, 6 which has headline increases by 10 centimeters, 7 every notch here. So it's basically asking how much does 8 the line of best-fit increase in Y values from one 9 notch to another notch. So let's just take two points here. 10 Let's take these two. So those are 10 centimeters apart. 11 Um, and let's just find what the Y value is for both of those. 12 So for the first one, when the headline is 40 centimeters, 13 the body length is about equal to 300, 14 maybe a little bit less than that. And then at 50 centimeters, 15 the body length is a little bit above three fifties, 16 let's say about 360. 17 So as you can see the increase in body length, 18 when the headlight increases by 10 centimeters is 360 minus 19 300. So the answer is around 60. 20 So let's find the answer closest to that, because this is just an estimate 21 and the answer choice closest to that is 75. 22 So B is the answer here.