Explanation for Question 29 From the Math (Calc) Section on the 2017 May Sat
Question 29 says in our colleges, 2 estimates that are that as a result of erosion, 3 the height of the great pyramid of Giza has been decreasing at a constant 4 rate since it was built the function above. 5 So the age of T equals negative one over 1 75 T plus 41 6 is used by the archeologists to model the height age of T in 7 feet of the pyramid T years after it was built, 8 according to the function, which of the following statements is true. 9 So let's quickly take a look at our function before getting into the answer 10 choices. We have a function in Y equals MX plus B format. 11 When we have that, we know that the B the Ford you one that's 12 the Y intercept, um, that's where we're starting. 13 So essentially how tall the pyramid was when it was first built. 14 Then this part right here, that's going to tell us our slope, 15 um, though negative one, over 1 75, 16 it will be our slope T is going to be an X value. 17 So in this case, it's going to be, um, a time a certain year. 18 So our slope, if we're talking about how it's decreasing over the years, 19 our slope is going to be in feet per years. 20 It'll decrease a certain amount of feet per year. 21 Um, knowing that if we have the one over 1 75, 22 we're just going to drop the negative for a little bit. We know are 23 decreasing. That's what the negative stands for. 24 So we want to just make sure our answer choice says decreasing, 25 not increasing, but we look at all our answer choices. 26 They all do say decreasing....