Explanation for Question 1 From the Math (Calc) Section on the 2019 May Sat
So question one says a care sharing service charges, 2 $6 per hour to rent a car, 3 plus a $10 fee for insurance, 4 which of the following gives the total cost C in dollars of a rental 5 that lasts hours. So with these types of problems, 6 I think it's helpful to mark up the question, 7 uh, so you can see which variables go together. 8 So first I know that the $6 is going to be next to the 9 variable, uh, key. 10 And that's because the service charges $6 per hour and T 11 represents hours. So every hour we need to multiply by six. 12 And then on top of that, there's going to be a $10 fee. 13 Now, there shouldn't be any variable next to the number 10, 14 because it's not per day or per hour, 15 the fee is just a flat fee. So from that we know that the 16 total costs were C should be equal to six T 17 plus 10. And so we know that the answer is 18 a.