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SAT Math 1.4 Numbers and Operations. Solve the equation.
SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?
SAT Math 4.3 Numbers and Operations 2174 Views
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Description:
SAT Math 4.3 Numbers and Operations
Transcript
- 00:02
Getting' Shmoopy with it...
- 00:04
If a and b are different prime numbers, which
- 00:06
of the following could also be prime?
- 00:08
And here are the potential answers...
- 00:13
The best way to deal with these questions
Full Transcript
- 00:15
is to substitute real prime numbers for the variables.
- 00:20
Let's say a = 2 and b = 3.
- 00:24
Now we can test each answer choice.
- 00:27
Choice A: 2 times 3 is 6. 6 is not prime. Boom -- gone.
- 00:32
Choice B: 2 cubed is 8. 8 isn't prime. Outta here.
- 00:37
Choice C: 2 plus 3 is 5. 5 is prime.
- 00:42
Choice D: 3 squared is 9. 9 isn't prime.
- 00:46
Only choice C can give us a prime number... ...so that's our answer.
- 00:57
An answer choice by any other letter would smell as sweet...
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