Explanation for Question 13 From the Math (Calc) Section on the 2017 May Sat
Question 13 asks us to write an inequality based on this paragraph of information 2 they give us. So let's read it and circle the important price as we 3 go through it. It says at the beginning of a laboratory experiment, 4 Miguel had 10 milliliters. 5 It was 10 milliliters of a solution in a flask. 6 The first step of the experience experiments consisted of Miguel pouring X 7 millimeters of the solution into a beaker and Y millimeters 8 of the solution into a different beaker. 9 There remains at least keyword right there, 10 four milliliters and the solution and the flask after the 11 first step, which of the following inequalities can be used to correctly or resent 12 this situation. So we want to write our inequality. 13 We know we start out with 10 because they tell us Miguel had 10 14 millimeters milliliters, and then he pours out X. 15 So we're going to subtract X. 16 And then again, he pours out Y so we're going to subtract Y 17 um, we want to make sure that we're not putting a plus Y the 18 only way that you could have a plus is if you had parentheses, 19 and then that would, when you distributed the negative, 20 it turns into a negative, but there's no need to go through the trouble. 21 We're subtracting. We're pouring out both of those X and Y. 22 So they are both negative. Now we know that we need to end with 23 four because that's how much is less, 24 but it says at least four. 25 So that's a key word right there at least means that it's going to 26 be the four or more four is the least number that it could be. 27 So it's going to be greater than, 28 or equal to four. And that's a.