Explanation for Question 4 From the Math (No Calc) Section on the 2020 March Sat
So let's take a look at number four. Number four tells us that our, 2 a Sally can spend up to a total of $20 on stranger, 3 on streamers and balloons for a party. And the streamers will cost 1 49 per 4 pack, and the balloons will cost 4 39 per pack. 5 So we have some prices, right. Of balloons and streamers. 6 And so just looking real quickly at our answer choices, we can imagine that 7 the variable S is our streamers and our variable B is balloons. 8 Right. And so let's go on. It says RSLA came by and did it 9 up. All right. So we're looking for which of the following inequalities in the 10 situations represents S the number of packs of streamers. 11 So S is the number of packs and B is also the number of 12 packs that we can buy, 13 assuming there's no sales tax, right? And so if we're looking at 1 49 times 14 S what we're doing here is we're taking the price of a pack of 15 streamers, which was 1 49, and we're multiplying it by the total number of packs 16 that we bought. 17 So what that's really showing us this 1.49 S is really the total price 18 of streamers altogether. Right? 19 We can imagine that as the number of packs of streamers, 20 that they buy increases, this price, 21 this total price of streamers is going to increase. 22 And so the question here is first, should we use a subtraction sign, 23 or should we use an addition sign? And what we know is that our 24 Sally is buying streamers and balloons, 25 right? So we want to add these prices together so that we can...