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SAT Math Videos 171 videos
SAT Math 1.1 Statistics and Probability. In which of the following data sets are the arithmetic mean and the median equal?
SAT Math: Statistics and Probability Drill 1, Problem 2. If the four largest numbers in the set were doubled, what would happen to the median...
SAT Math 1.3 Statistics and Probability. Approximately what is the probability that they will be placed in alphabetical order?
SAT Math 3.6 Numbers and Operations 220 Views
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Description:
SAT Math 3.6 Numbers and Operations
Transcript
- 00:02
Put this in your calculator and shmoop it...
- 00:05
If a + b = 12, b + c = 17, and a + c = 9, what is the value of a + b + c?
- 00:14
And here are the potential answers...
- 00:18
If we push our way through the annoying crowd of variables...
- 00:21
...we'll find that what this question is actually asking
Full Transcript
- 00:24
is just for us to sum a, b, and c.
- 00:28
What if... we add up all three of the equations that are given to us?
- 00:32
In that case, we get a + b + b + c + a + c equals 12 + 17 + 9.
- 00:42
And if we combine all like terms...we get 2a + 2b + 2c equals 38.
- 00:52
Next, we can distribute the 2 to make the equation 2 times the quantity a + b + c... equals 38.
- 00:59
Divide both sides by 2, and our equation looks like this: a + b + c = 19.
- 01:04
Answer B.
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