[Video] Q14: The cost of using a telephone in a hotel meeting room is $0.20 per minute. which of the following equations represents the total cost c, in dollars, for h hours of phone use?

Explanation for Question 14 From the Math (Calc) Section on the Official Sat Practice Test 3

So for number 14, we're told that the cost of using a telephone at 2 a hotel meeting is points twenties, 3 20 cents, not point 20 cents point, 4 uh, 20 cents per minute. And so we're trying to find out what the costs 5 would be, right? So we can make a little table to help us figure 6 this out where M is going to be minutes and C is going to 7 be cost. Right? So if we're at one minute, we know it costs 20 cents. 8 If we're to, well, that would be another 20 cents. 9 That'll be 0.4, three, 10 that's another 20 cents 0.6. We can see what's essentially happening here is 11 that you're taking the 20 cents and you're multiplying it times the number of minutes. 12 Now, the only answer choice that remotely resembles that format is right here in 13 a, so perhaps you can see that choose a and move on, 14 or you can think about it a little more and think, okay, 15 how do I get from minutes to hours? Right? And we know that for 16 a minutes, you multiply 60 times the number of hours. 17 For example, for one hour, it would be 60 times one, 18 right? Which tells us that there are in fact 60 minutes in an hour. 19 So minutes is equal to 60 times hours, 20 which we can just write as 60 H and then plug in for M 21 and our original equation and see the, 22 um, our cost is really 0.2 times 60 H, 23 which is again, what we see here in answer choice, 24 a.